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List of New South Wales state by-elections

None

This is a list of by-elections for the New South Wales Legislative Assembly. A by-election may be held when a member's seat becomes vacant through resignation, death or some other reasons. These are referred to as casual vacancies.

Brackets around a date (D/M/Y) indicate that the candidate was unopposed when nominations closed or that, as a result of an appeal against an election result, the sitting member was replaced by the appellant. These candidates were declared "elected unopposed" with effect from the date of the closing of nominations or appeal decision, and there was no need to hold a by-election.
By-elections which resulted in a change in party representation are highlighted as: Gains for the Labor Party and its splinter groups in ; for the Liberal Party and its predecessors in ; for the National Party and its predecessors in ; for independents and minor parties in ; for the Free Trade Party in and for the Protectionist Party in . NOTOC

By-election	Incumbent	Party	Reason	Date	Winner	Party	By-election	Incumbent	Reason	Date
Kiama	Gareth Ward			Independent	Resigned moments before expulsion for sexual assault conviction	13 September 2025	Katelin McInerney		Labor
Port Macquarie	Leslie Williams			Liberal	Resigned	15 March 2025	Robert Dwyer		Liberal
Pittwater	Rory Amon			Liberal	Resigned	19 October 2024	Jacqui Scruby		Independent
Epping	Dominic Perrottet			Liberal	Resigned	19 October 2024	Monica Tudehope		Liberal
Hornsby	Matt Kean			Liberal	Resigned	19 October 2024	James Wallace		Liberal
Northern Tablelands	Adam Marshall			National	Resigned	22 June 2024	Brendan Moylan		National
Bega	Andrew Constance			Liberal	Resigned to contest federal seat of Gilmore	12 February 2022	Michael Holland		Labor
Monaro	John Barilaro			National	Resigned	12 February 2022	Nichole Overall		National
Strathfield	Jodi McKay			Labor	Resigned	12 February 2022	Jason Yat-Sen Li		Labor
Willoughby	Gladys Berejiklian			Liberal	Resigned due to ICAC investigation.	12 February 2022	Tim James		Liberal
Upper Hunter	Michael Johnsen			National	Resigned due to police investigation	22 May 2021	Dave Layzell		National
Wagga Wagga	Daryl Maguire			Liberal	Resigned due to ICAC investigation	8 September 2018	Joe McGirr		Independent
Blacktown	John Robertson			Labor	Resigned	14 October 2017	Stephen Bali		Labor
Cootamundra	Katrina Hodgkinson			National	Resigned	14 October 2017	Steph Cooke		National
Murray	Adrian Piccoli			National	Resigned	14 October 2017	Austin Evans		National
Gosford	Kathy Smith			Labor	Resigned due to ill health	8 April 2017	Liesl Tesch		Labor
Manly	Mike Baird			Liberal	Resigned	8 April 2017	James Griffin		Liberal
North Shore	Jillian Skinner			Liberal	Resigned	8 April 2017	Felicity Wilson		Liberal
Canterbury	Linda Burney			Labor	Resigned to contest federal seat of Barton	12 November 2016	Sophie Cotsis		Labor
Orange	Andrew Gee			National	Resigned to contest federal seat of Calare	12 November 2016	Philip Donato		SFF
Wollongong	Noreen Hay			Labor	Resigned	12 November 2016	Paul Scully		Labor
	Newcastle	Tim Owen			Liberal	Resigned due to ICAC investigation	25 October 2014	Tim Crakanthorp		Labor
	Charlestown	Andrew Cornwell			Liberal	Resigned due to ICAC investigation	25 October 2014	Jodie Harrison		Labor
	Miranda	Graham Annesley			Liberal	Resigned to become CEO of Gold Coast Titans rugby league team	19 October 2013	Barry Collier		Labor
	Northern Tablelands	Richard Torbay			Independent	Resigned	25 May 2013	Adam Marshall		National
	Sydney	Clover Moore			Independent	Resigned due to new state laws preventing dual membership of state parliament and local council	27 October 2012	Alex Greenwich		Independent
	Heffron	Kristina Keneally			Labor	Resigned after being appointed CEO of Basketball Australia	25 August 2012	Ron Hoenig		Labor
	Clarence	Steve Cansdell			National	Resigned after falsifying a statutory declaration regarding a speeding offence	19 November 2011	Chris Gulaptis		National
	Penrith	Karyn Paluzzano			Labor	Resigned after misleading ICAC	19 June 2010	Stuart Ayres		Liberal
	Ryde	John Watkins			Labor	Resigned to spend time with family	18 October 2008	Victor Dominello		Liberal
	Port Macquarie	Rob Oakeshott			Independent	Resigned to contest federal Lyne by-election	18 October 2008	Peter Besseling		Independent
	Lakemba	Morris Iemma			Labor	Resigned after losing confidence of caucus	18 October 2008	Robert Furolo		Labor
	Cabramatta	Reba Meagher			Labor	Resigned after being dismissed from cabinet	18 October 2008	Nick Lalich		Labor
	Pittwater	John Brogden			Liberal	Ill health	26 November 2005	Alex McTaggart		Independent
	Macquarie Fields	Craig Knowles			Labor	Resigned after it became apparent that he would not become Premier	17 September 2005	Steven Chaytor		Labor
	Maroubra	Bob Carr			Labor	Resigned as Premier	17 September 2005	Michael Daley		Labor
	Marrickville	Andrew Refshauge			Labor	Resigned as Deputy Premier	17 September 2005	Carmel Tebbutt		Labor
	Dubbo	Tony McGrane			Independent	Death	20 November 2004	Dawn Fardell		Independent
	Hornsby	Stephen O'Doherty			Liberal	Resigned	23 February 2002	Judy Hopwood		Liberal
	Tamworth	Tony Windsor			Independent	Resigned to contest federal seat of New England at 2001 election	8 December 2001	John Cull		National
	Auburn	Peter Nagle			Labor	Ill health	8 September 2001	Barbara Perry		Labor
	Campbelltown	Michael Knight			Labor	Resigned after completion of term as Olympics Minister	3 February 2001	Graham West		Labor
	Sutherland	Chris Downy			Liberal	Resigned	12 February 1997	Lorna Stone		Liberal
	Port Macquarie	Wendy Machin			National	Resigned	30 November 1996	Rob Oakeshott		National
	Clarence	Ian Causley			National	Resigned to contest federal seat of Page at the 1996 election	25 May 1996	Harry Woods		Labor
	Orange	Garry West			National	Resigned	25 May 1996	Russell Turner		National
	Pittwater	Jim Longley			Liberal	Resigned	25 May 1996	John Brogden		Liberal
	Southern Highlands	John Fahey			Liberal	Resigned to contest federal seat of Macarthur at the 1996 election	25 May 1996	Peta Seaton		Liberal
	Strathfield	Paul Zammit			Liberal	Resigned to contest federal seat of Lowe at the 1996 election	25 May 1996	Bruce MacCarthy		Liberal
	Cabramatta	John Newman			Labor	Assassinated by Phuong Ngo	22 October 1994	Reba Meagher		Labor
	Parramatta	Andrew Ziolkowski			Labor	Death	27 August 1994	Gabrielle Harrison		Labor
	Vaucluse	Michael Yabsley			Liberal	Resigned	9 April 1994	Peter Debnam		Liberal
	North Shore	Phillip Smiles			Liberal	Resigned	5 February 1994	Jillian Skinner		Liberal
	The Hills	Tony Packard			Liberal	Resigned after involvement in a business scandal	28 August 1993	Michael Richardson		Liberal
	Gordon	Tim Moore			Liberal	Resigned (see Metherell affair)	22 August 1992	Jeremy Kinross		Liberal
	Ku-ring-gai	Nick Greiner			Liberal	Resigned after losing Premiership (see Metherell affair)	22 August 1992	Stephen O'Doherty		Liberal
	Davidson	Terry Metherell			Independent	Accepted an appointment in the public service (see Metherell affair)	2 May 1992	Andrew Humpherson		Liberal
	The Entrance	Bob Graham			Liberal	Result overturned by the Court of Disputed Returns	18 January 1992	Grant McBride		Labor
	Coffs Harbour	Matt Singleton			National	Resigned	3 November 1990	Andrew Fraser		National
	Macquarie Fields	Stan Knowles			Labor	Resigned	3 November 1990	Craig Knowles		Labor
	The Hills	Fred Caterson			Liberal	Resigned	1 September 1990	Tony Packard		Liberal
	Granville	Laurie Ferguson			Labor	Successfully contested the federal seat of Reid at the 1990 election	23 June 1990	Kim Yeadon		Labor
	Heffron	Laurie Brereton			Labor	Successfully contested the federal seat of Kingsford-Smith at the 1990 election	23 June 1990	Deirdre Grusovin		Labor
	Smithfield	Janice Crosio			Labor	Successfully contested the federal seat of Prospect at the 1990 election	23 June 1990	Carl Scully		Labor
	Liverpool	George Paciullo			Labor	Resigned after being passed over as leader of the party	29 April 1989	Peter Anderson		Labor
	Wallsend	Ken Booth			Labor	Death	17 December 1988	John Mills		Labor
	North Shore	Ted Mack			Independent	Resigned	5 November 1988	Robyn Read		Independent
	Port Stephens	Bob Martin			Labor	Result voided by the Court of Disputed Returns	5 November 1988	Bob Martin		Labor
	Vaucluse	Ray Aston			Liberal	Death	(6 June 1988)*	Michael Yabsley		Liberal
	Northern Tablelands	Bill McCarthy			Labor	Resignation due to ill health, dying 3 days later	23 May 1987	Ray Chappell		National
	Bankstown	Ric Mochalski			Labor	Resigned after being charged with fraud	31 January 1987	Doug Shedden		Labor
	Heathcote	Rex Jackson			Labor	Resigned amidst a corruption scandal that ultimately led to his imprisonment	31 January 1987	Ian McManus		Labor
	Rockdale	Brian Bannon			Labor	Accepted a government position and created a seat for the Premier	2 August 1986	Barrie Unsworth		Labor
	Bass Hill	Neville Wran			Labor	Resigned	2 August 1986	Michael Owen		Liberal
	Pittwater	Max Smith			Independent	Resigned	31 May 1986	Jim Longley		Liberal
	Vaucluse	Rosemary Foot			Liberal	Resigned	31 May 1986	Ray Aston		Liberal
	Kiama	Bill Knott			Labor	Resigned	1 February 1986	Bob Harrison		Labor
	Canterbury	Kevin Stewart			Labor	Accepted position as Agent-General in London	1 February 1986	Kevin Moss		Labor
	Cabramatta	Eric Bedford			Labor	Resigned	1 February 1986	John Newman		Labor
	Gloucester	Leon Punch			National	Resigned	12 October 1985	Wendy Machin		National
	Peats	Paul Landa			Labor	Death	2 February 1985	Tony Doyle		Labor
	Murray	Tim Fischer			National	Successfully contested the seat of Farrer at the 1984 federal election	2 February 1985	Jim Small		National
	Maroubra	Bill Haigh			Labor	Resigned after losing cabinet position	22 October 1983	Bob Carr		Labor
	Marrickville	Tom Cahill			Labor	Death	22 October 1983	Andrew Refshauge		Labor
	Riverstone	Tony Johnson			Labor	Resigned	22 October 1983	Richard Amery		Labor
	Kogarah	Bill Crabtree			Labor	Resigned after losing cabinet position	22 October 1983	Brian Langton		Labor
	Drummoyne	Michael Maher			Labor	Successfully contested the federal seat of Lowe at the 1982 Lowe by-election	17 April 1982	John Murray		Labor
	Cessnock	Bob Brown			Labor	Successfully contested the federal seat of Hunter at the 1980 election	21 February 1981	Stan Neilly		Labor
	Maitland	Milton Morris			Liberal	Unsuccessfully contested the federal seat of Lyne at the 1980 election	21 February 1981	Peter Toms		Liberal
	Oxley	Bruce Cowan			National Country	Successfully contested the federal seat of Lyne at the 1980 election	21 February 1981	Peter King		National Country
	Sturt	Tim Fischer			National Country	Resigned to successfully contest the seat of Murray at the 1980 Murray by-election	21 February 1981	John Sullivan		National Country
	Bankstown	Nick Kearns			Labor	Death	13 September 1980	Ric Mochalski		Labor
	Ku-ring-gai	John Maddison			Liberal	Resigned	13 September 1980	Nick Greiner		Liberal
	Murray	Mary Meillon			Liberal	Death	13 September 1980	Tim Fischer		National Country
	Castlereagh	Jack Renshaw			Labor	Resigned	23 February 1980	Jim Curran		Labor
	Earlwood	Eric Willis			Liberal	Resigned	15 July 1978	Ken Gabb		Labor
	The Hills	Max Ruddock			Liberal	Resigned	9 October 1976	Fred Caterson		Liberal
	Orange	Charles Cutler			National Country	Resigned	14 February 1976	Garry West		National Country
	Wagga Wagga	Wal Fife			Liberal	Resigned to contest the federal seat of Farrer at the next election	6 December 1975	Joe Schipp		Liberal
	Lane Cove	Ken McCaw			Liberal	Resigned	8 February 1975	John Dowd		Liberal
	Pittwater	Robert Askin			Liberal	Resigned	8 February 1975	Bruce Webster		Liberal
	Coogee	Ross Freeman			Liberal	Result voided by the Court of Disputed Returns	20 July 1974	Michael Cleary		Labor
	Goulburn	Ron Brewer			National Country	Unsuccessfully contested the federal seat of Eden-Monaro at the 1974 federal election	20 July 1974	Ron Brewer		National Country
	Murray	Joe Lawson			Independent	Death	6 October 1973	Mary Meillon		Liberal
	Byron	Stanley Stephens			Country	Resigned	17 February 1973	Jack Boyd		Country
	Armidale	Davis Hughes			Country	Accepted position as Agent-General in London	17 February 1973	David Leitch		Country
	Hawkesbury	Bernie Deane			Liberal	Resigned	17 February 1973	Kevin Rozzoli		Liberal
	Charlestown	Jack Stewart			Labor	Death	18 November 1972.	Richard Face		Labor
	Mosman	Pat Morton			Liberal	Resigned	29 July 1972	David Arblaster		Liberal
	Georges River	Douglas Cross			Liberal	Death	19 September 1970	Frank Walker		Labor
	Murrumbidgee	Al Grassby			Labor	Successfully contested the federal seat of Riverina at the 1969 federal election	14 February 1970	Lin Gordon		Labor
	Randwick	Lionel Bowen			Labor	Successfully contested the federal seat of Kingsford Smith at the 1969 federal election	14 February 1970	Laurie Brereton		Labor
	Upper Hunter	Frank O'Keefe			Country	Successfully contested the federal seat of Paterson at the 1969 federal election	14 February 1970	Col Fisher		Country
	Lake Macquarie	Jim Simpson			Labor	Death	9 April 1969	Merv Hunter		Labor
	Bathurst	Gus Kelly			Labor	Death	6 May 1967	Clive Osborne		Country
	Oxley	Les Jordan			Liberal	Death	6 November 1965	Bruce Cowan		Country
	Bondi	Abe Landa			Labor	Accepted the position of state Agent-General in London	6 November 1965	Syd Einfeld		Labor
	Lakemba	Stan Wyatt			Labor	Death	19 September 1964	Vince Durick		Labor
	Waratah	Edward Greaves			Labor	Death	8 August 1964	Frank Purdue		Independent
	Wollongong-Kembla	Rex Connor			Labor	Successfully contested the federal seat of Cunningham at the 1963 election	29 February 1964	Doug Porter		Labor
	Casino	Ian Robinson			Country	Successfully contested the federal seat of Cowper at the 1963 election	29 February 1964	Richmond Manyweathers		Country
	Liverpool Plains	Roger Nott			Labor	Accepted an appointment as Administrator of the Northern Territory	25 March 1961	Frank O'Keefe		Country
	Paddington-Waverley	William Ferguson			Labor	Death	25 February 1961	Keith Anderson		Labor
	Temora	Doug Dickson			Country	Death	8 October 1960	Jim Taylor		Country
	Kurri Kurri	George Booth			Labor	Death	8 October 1960	Ken Booth		Labor
	Cook's River	Joseph Cahill			Labor	Death	12 December 1959	Tom Cahill		Labor
	Lismore	Jack Easter			Country	Result voided by the Court of Disputed Returns	12 September 1959.	Keith Compton		Labor
	Wagga Wagga	Eddie Graham			Labor	Death	14 December 1957	Wal Fife		Liberal
	Wollondilly	Blake Pelly			Liberal	Resigned	26 October 1957	Tom Lewis		Liberal
	Vaucluse	Murray Robson			Liberal	Resigned	24 August 1957	Geoffrey Cox		Liberal
	Kahibah	Tom Armstrong			Independent Labor	Death	13 April 1957	Jack Stewart		Labor
	Burwood	Leslie Parr			Liberal	Death	16 February 1957	Ben Doig		Liberal
	Bulli	Laurie Kelly Sr.			Labor	Death	9 July 1955	Rex Jackson		Labor
	Clarence	Cecil Wingfield			Country	Death	26 March 1955	Bill Weiley		Country
	Phillip	Tom Shannon			Labor	Death	14 August 1954	Pat Hills		Labor
	Leichhardt	Claude Matthews			Labor	Committed suicide	20 March 1954	Reg Coady		Labor
	Kahibah	Joshua Arthur			Labor	Resigned after being expelled from the Labor Party, following adverse findings into his conduct by a Royal Commission	31 October 1953	Tom Armstrong		Independent Labor
	Waverley	Clarrie Martin			Labor	Death	31 October 1953	William Ferguson		Labor
	Dulwich Hill	George Weir			Labor	Appointed to the Industrial Relations Commission of New South Wales	20 June 1953	Cliff Mallam		Labor
	Ashfield	Athol Richardson			Liberal	Accepted an appointment as a Judge of the Supreme Court	28 June 1952	Jack Richardson		Labor
	Liverpool	James McGirr			Labor	Appointed chair of the Maritime Services Board	24 May 1952	Jack Mannix		Labor
	Neutral Bay	Ivan Black			Liberal	Unsuccessfully contested preselection for the federal seat of Warringah at the 1951 election	(21 May 1951)	Ivan Black		Liberal
	Burwood	Gordon Jackett			Liberal	Death	2 June 1951	Leslie Parr		Liberal
	Concord	Brice Mutton			Liberal	Death	11 February 1950	John Adamson		Liberal
	Wollongong-Kembla	Billy Davies			Labor	Successfully contested the seat of Cunningham at the 1949 federal election	11 February 1950	Baden Powell		Labor
	Armidale	David Drummond			Country	Successfully contested the seat of New England at the 1949 federal election	11 February 1950	Davis Hughes		Country
	Wollondilly	Jeff Bate			Liberal	Successfully contested the seat of Macarthur at the 1949 federal election	(23 January 1950)	Blake Pelly		Liberal
	Cessnock	Jack Baddeley			Labor	Accepted an appointment as Chairman of the State Coal Mine Authority	8 October 1949	John Crook		Labor
	Redfern	George Noble			Labor	Death	8 October 1949	Kevin Dwyer		Labor
	Concord	Bill Carlton			Labor	Death	12 March 1949	Brice Mutton		Liberal
	Cobar	Mat Davidson			Labor	Death	12 March 1949	Ernest Wetherell		Labor
	Kogarah	William Currey			Labor	Death	17 July 1948	Douglas Cross		Liberal
	Coogee	Lou Cunningham			Labor	Death	8 May 1948	Kevin Ellis		Liberal
	Hartley	Hamilton Knight			Labor	Accepted an appointment to the Commonwealth Industrial Commission	13 December 1947	Jim Chalmers		Labor
	Corowa	Christopher Lethbridge			Liberal	Unsuccessfully contested the federal seat of Riverina at the 1946 federal election	9 November 1946	Ebenezer Kendell		Country
	Ashfield	Athol Richardson			Liberal	Unsuccessfully contested the federal seat of Parkes at the 1946 federal election	9 November 1946	Athol Richardson		Liberal
	Auburn	Jack Lang			Lang Labor	Successfully contested the federal seat of Reid at the 1946 federal election	9 November 1946	Chris Lang		Lang Labor
	Albury	Alexander Mair			Liberal	Unsuccessfully contested a seat in the Australian Senate at the 1946 federal election	9 November 1946	John Hurley		Labor
	Goulburn	Jack Tully			Labor	Resigned	1 June 1946	Laurie Tully		Labor
	Neutral Bay	Reginald Weaver			Liberal	Death	15 December 1945	Ivan Black		Liberal
	Manly	Alfred Reid			Liberal	Death	15 September 1945	Douglas Darby		Liberal
	Blacktown	Frank Hill			Labor	Death	18 August 1945	John Freeman		Labor
	Ryde	James Shand			Independent Democrat	Death	3 February 1945	Eric Hearnshaw		Liberal
	Auburn	Jack Lang			Lang Labor	Unsuccessfully contested the federal seat of Reid at the 1943 election	2 October 1943	Jack Lang		Lang Labor
	Lachlan	Griffith Evans			Country	Death	25 September 1943	John Chanter		Labor
	Willoughby	Edward Sanders			UAP	Death	25 September 1943	George Brain		UAP
	South Coast	Rupert Beale			Independent	Death	14 November 1942	Jack Beale		Independent
	Dubbo	George Wilson			Country	Death	6 June 1942	Clarrie Robertson		Labor
	Barwon	Ben Wade			Country	Unsuccessfully contest the federal seat of Gwydir at the 1940 election	16 November 1940	Roy Heferen		Labor
	Ryde	Eric Spooner			UAP	Successfully contested the federal seat of Robertson at the 1940 election	14 September 1940	Arthur Williams		Labor
	Croydon	Bertram Stevens			UAP	Unsuccessfully contested the federal seat of Lang at the 1940 election	7 September 1940	David Hunter		UAP
	Tamworth	Frank Chaffey			UAP	Death	10 August 1940	Bill Chaffey		UAP
	Upper Hunter	Malcolm Brown			Country	Death	7 October 1939	D'Arcy Rose		Country
	Waverley	John Waddell			UAP	Death	22 April 1939	Clarrie Martin		Industrial Labor
	Hurstville	James Webb			UAP	Death	18 March 1939	Clive Evatt		Industrial Labor
	Balmain	John Quirk			Labor	Death	14 January 1939	Mary Quirk		Labor
	Wollondilly	Mark Morton			UAP	Death	12 November 1938	Jeff Bate		UAP
	Gordon	Harry Turner			UAP	Result voided by Court of Disputed Returns	24 September 1938	Harry Turner		UAP
	Coogee	John Dunningham			UAP	Death	25 June 1938	Thomas Mutch		UAP
	Corowa	Richard Ball			Country	Death	11 December 1937	Christopher Lethbridge		Independent
	Gordon	Philip Goldfinch			UAP	Resigned (Increased commitment to business interests)	7 August 1937	Harry Turner		UAP
	Woollahra	Daniel Levy			UAP	Death	26 June 1937	Harold Mason		Independent UAP
	Vaucluse	William Foster			UAP	Death	29 August 1936	Murray Robson		Independent UAP
	Gordon	Thomas Bavin			UAP	Accepted an appointment as a Judge of the Supreme Court	(23 November 1935)	Philip Goldfinch		UAP
	Leichhardt	Joe Lamaro			Labor (NSW)	Unsuccessfully contested the federal seat of Watson at the 1934 election	20 October 1934	Claude Matthews		Labor (NSW)
	Gloucester	Walter Bennett			UAP	Death	25 August 1934	Charles Bennett		UAP
	Hamilton	Hugh Connell			Labor (NSW)	Death	24 February 1934	William Brennan		Labor (NSW)
	Annandale	Robert Stuart-Robertson			Labor (NSW)	Death	24 June 1933	Bob Gorman		Labor (NSW)
	Bulli	Andrew Lysaght, junior			Labor (NSW)	Death	3 June 1933	John Sweeney		Labor (NSW)
	Lismore	William Missingham			Country	Death	11 March 1933	William Frith		Country
	Leichhardt	Barney Olde			Labor (NSW)	Death	10 December 1932	Joe Lamaro		Labor (NSW)
	Upper Hunter	William Cameron			Nationalist	Death	13 June 1931	Malcolm Brown
	Annandale	Robert Stuart-Robertson			Labor (NSW)	Insolvency	25 April 1931	Robert Stuart-Robertson		Labor (NSW)
	Clarence	Alfred Pollack			Country	Death	7 March 1931	Alfred Henry		Country
	Lane Cove	Bryce Walmsley			Nationalist	Death	26 July 1930	Herbert FitzSimons		Nationalist
	Ashfield	Milton Jarvie			Nationalist	Resigned after being implicated in a bribery scandal	5 October 1929	Milton Jarvie		Nationalist
	Parramatta	Albert Bruntnell			Nationalist	Death	23 February 1929	Herbert Lloyd		Nationalist
	Coogee	Hyman Goldstein			Nationalist	Death – probably murdered by ex-MLA Tom Ley	22 September 1928	John Dunningham		Nationalist
	Hamilton	David Murray			Labor	Death	8 September 1928	James Smith		Labor
	Wollondilly	George Fuller			Nationalist	Accepted position as Agent-General in London in February 1928	3 March 1928	Mark Morton		Nationalist
	Cumberland	William FitzSimons			Nationalist	Death	(22 September 1926)	James Shand		Nationalist
	North Shore	Alick Kay ¶			Independent	Accepted a position on the Metropolitan Meat Board.	(22 September 1926)	Arthur Tonge		Labor
	Goulburn	John Perkins			Nationalist	Resigned to successfully contest the federal seat of Eden-Monaro at the 1926 Eden-Monaro by-election.	(21 January 1926)	Henry Bate		Nationalist
St George	Thomas Ley			Nationalist	Resigned to successfully contest the federal seat of Barton at the 1925 election	(30 September 1925)	William Bagnall		Nationalist
Sydney	John Birt			Labor	Death	(24 June 1925)	Patrick Minahan		Labor
	North Shore	Arthur Cocks			Nationalist	Accepted position of Agent-General in London	(24 March 1925)	Alfred Reid		Nationalist
	Namoi	Patrick Scully			Labor	Resigned	(20 September 1923)	William Scully		Labor
	Sturt	Jabez Wright			Labor	Death	(30 September 1922)	Ted Horsington		Labor
	Wammerawa	William Ashford			Independent	Result overturned (Change of member without by-election)	(26 July 1922)	Joseph Clark		Labor
	Goulburn ‡	William Millard			Nationalist	Death	(22 November 1921)	John Perkins		Nationalist
	Balmain	John Storey			Labor	Death	(18 October 1921)	Tom Keegan		Labor
	Newcastle	William Kearsley			Labor	Death	(30 August 1921)	David Murray		Labor
	Sturt ¶	Percy Brookfield				Murdered while trying to disarm a deranged man at Riverton	(30 August 1921)	Jabez Wright		Labor
	Oxley	George Briner			Progressive	Death	(15 December 1920)	Theodore Hill		Progressive
	Eastern Suburbs	James Fingleton			Labor	Death	(15 December 1920)	Daniel Dwyer		Labor
	Goulburn	Gus James			Nationalist	Accepted an appointment as a Judge of the Supreme Court	(15 December 1920)	William Millard		Nationalist
	Murray	George Beeby			Progressive	Accepted a judicial appointment	(15 December 1920)	Matthew Kilpatrick		Progressive
Paddington	Lawrence O'Hara			Labor	Death	26 July 1919	John Birt		Labor
	Paddington	John Osborne			Labor	Accepted as appointment to the Metropolitan Meat Board	24 May 1919	Lawrence O'Hara		Labor
	Petersham	John Cohen			Nationalist	Accepted an appointment as a Judge of the District Court	22 March 1919	Sydney Shillington		Nationalist
	Monaro	Gus Miller			Labor	Death	23 November 1918	John Bailey		Labor
	Upper Hunter	Mac Abbott			Nationalist	Resigned	8 June 1918	William Cameron		Nationalist
	Cobar	Charles Fern			Labor	Death	(1 June 1918)	Mat Davidson		Labor
	Gloucester	Richard Price			Independent Liberal	Expelled after a Royal Commission found he had made "wanton lies" in an attack on the Lands Minister William Ashford	10 November 1917	Richard Price		Independent Liberal
	Murray	Robert Scobie			Nationalist	Death	22 September 1917	Brian Doe		Nationalist
	Macquarie	Thomas Thrower			Labor	Death	12 July 1917	Patrick McGirr		Labor
	Sturt	John Cann			Labor	Accepted the position of Commissioner of Railways	3 February 1917	Percy Brookfield		Labor
	Bingara	George McDonald			Labor	Resigned from Labor after the 1916 NSW Labor Conference passed a motion of no confidence in the Holman government	10 June 1916	George McDonald		Independent Labor
	Parramatta	Tom Moxham			Liberal Reform	Death	12 February 1916	Albert Bruntnell		Liberal Reform
	Drummoyne	George Richards			Liberal Reform	Death	22 January 1916	Alexander Graff		Liberal Reform
	Willoughby	Edward Larkin			Labor	Died on active service on 25 April 1915	25 September 1915	John Haynes		Independent
	Wollondilly	Frank Badgery			Liberal Reform	Death	(2 October 1915)	George Fuller		Liberal Reform
	Armidale	George Braund			Liberal Reform	Died on active service	(18 September 1915)	Herbert Lane		Liberal Reform
	Clarence	John McFarlane			Liberal Reform	Death	14 August 1915	William Zuill		Independent Liberal
	Castlereagh	John Treflé			Labor	Death	20 February 1915	Guy Arkins		Labor
	Canterbury	Henry Peters			Labor	Bankrupt	10 October 1914	George Cann		Labor
	Wollondilly	William McCourt			Liberal Reform	Death	19 July 1913	Frank Badgery		Liberal Reform
	Blayney	George Beeby			Labor	Resigned from the ministry, parliament and party in protest at the power of the extra-parliamentary Labor Party executive	23 January 1913	George Beeby		Independent
	Alexandria	John Dacey			Labor	Death	18 May 1912	Simon Hickey		Labor
	Maitland	John Gillies			Independent Liberal	Death	28 October 1911	Charles Edward Nicholson		Liberal Reform
	Yass	Niels Nielson			Labor	¶	5 March 1913	Greg McGirr		Labor
	Cobar	Donald Macdonell			Labor	¶	(16 December 1911)	Charles Fern		Labor
	Cobar	Donald Macdonell			Labor	¶	(7 October 1911)	Donald Macdonell		Labor
	Liverpool Plains	John Perry			Liberal Reform	¶	28 October 1911	William Ashford		Labor
	Liverpool Plains	Henry Hoyle			Labor	¶	16 August 1911	John Perry		Liberal Reform
	Mudgee	Bill Dunn			Labor	¶	16 August 1911	Bill Dunn		Labor
	Belmore	Edward O'Sullivan			Labor	Death	21 May 1910	Patrick Minahan		Labor
	Darling Harbour	John Norton			Independent	Resigned to unsuccessfully contest a Senate seat at the 1910 election	13 April 1910	John Cochran		Labor
	Queanbeyan	Granville Ryrie			Liberal Reform	Resigned to unsuccessfully contest the federal seat of Werriwa at the 1910 election	13 April 1910	John Cusack		Labor
Upper Hunter	William Fleming			Liberal Reform	Resigned to unsuccessfully contest the federal seat of New England at the 1910 election	13 April 1910	William Ashford		Labor
	Northumberland	Matthew Charlton			Labor	Resigned to successfully contest the federal seat of Hunter at the 1910 election	(23 March 1910)	William Kearsley		Labor
	Sturt	Arthur Griffith			Labor	Resigned from parliament after a dispute with the Speaker	(21 November 1908)	Arthur Griffith		Labor
	St George	Joseph Carruthers			Liberal Reform	Resigned	20 May 1908	William Taylor		Liberal Reform
	Blayney	Paddy Crick			Progressive	Resigned after being acquitted of corruption charges	12 January 1907	John Withington		Liberal Reform
	Castlereagh	Hugh Macdonald			Labor	Death	24 November 1906	John Treflé		Labor
	Surry Hills	John Norton			Independent	Challenged William Holman to face a by-election	21 July 1906	Albert Bruntnell		Liberal Reform
	Cootamundra	William Holman			Labor	Challenged to a by-election by John Norton	17 July 1906	William Holman		Labor
	Queanbeyan	Alan Millard			Liberal Reform	Criminal conviction: Fraud	7 April 1906	Granville Ryrie		Liberal Reform
	Ashfield	Frederick Winchcombe			Liberal Reform	Extended absence visiting England	16 August 1905	William Robson		Liberal Reform
	Rous	John Coleman			Liberal Reform	Death	11 February 1905	George Hindmarsh		Liberal Reform
	Ryde	Frank Farnell			Independent Liberal	Appointment to Fisheries Board	23 January 1904	Edward Terry		Independent Liberal
	Illawarra	Archibald Campbell			Liberal Reform	Death	9 January 1904	Edward Allen		Liberal Reform
	Moree	William Webster			Labor	Successful candidate for Gwydir at federal election	12 December 1903	Percy Stirton		Liberal Reform
	Armidale	Edmund Lonsdale			Liberal Reform	Successful candidate for New England at federal election	12 December 1903	Sydney Kearney		Liberal Reform
	Waratah	Arthur Griffith			Labor	Unsuccessful candidate for Senate at federal election	5 December 1903	Matthew Charlton		Labor
	Glen Innes	Francis Wright			Progressive	Death	28 October 1903	Follett Thomas		Liberal Reform
	Willoughby	George Howarth			Liberal Reform	Bankruptcy	9 September 1903	Charles Wade		Liberal Reform
Tamworth	Raymond Walsh			Progressive	Bankruptcy	4 April 1903	John Garland		Liberal Reform
	Balmain South	Sydney Law			Labor	Refused Caucus solidarity pledge	6 December 1902	Sydney Law		Independent Labor
	Inverell	William McIntyre			Progressive	Death	31 May 1902	George Jones		Labor
	Sydney-Pyrmont	Samuel Smith			Labor	Appointment to Court of Arbitration	24 May 1902	John McNeill		Labor
	Condoublin	Patrick Clara			Labor	Election overturned by the Elections and Qualifications Committee	4 November 1901	Patrick Clara		Labor
	Hume	William Lyne				Successfully contested Hume at 1901 federal election	17 April 1901	Gordon McLaurin
	Ashfield	Bernhard Wise				Appointed to Legislative Council	10 November 1900	Frederick Winchcombe
	Uralla-Walcha	William Piddington				Death	27 October 1900	Michael MacMahon
	Bourke	William Davis				Resignation due to insolvency	(6 September 1900)	William Davis
	Canterbury	Sydney Smith				By-election result voided by the Elections and Qualifications Committee	28 July 1900	Thomas Taylor		Independent
	Bathurst	Francis Suttor				Appointed to Legislative Council	25 June 1900	William Young
	Canterbury	Varney Parkes				Resignation	9 June 1900	Sydney Smith
	Uralla-Walcha	William Piddington				Resignation due to insolvency	9 June 1900	William Piddington
	Sydney-Phillip	Henry Copeland				Accepted post as Agent-General in London	7 April 1900	Daniel O'Connor
	Hastings and Macleay	Edmund Barton				Resigned to take Constitution to London	1 March 1900	Francis Clarke
	Boorowa	Kenneth Mackay				Appointed to Legislative Council	30 September 1899	Niels Nielsen
	Northumberland	Richard Stevenson				Death	20 July 1899	John Norton
	Parramatta	William Ferris				Election declared void by the Elections and Qualifications Committee	26 October 1898	William Ferris
	Hastings and Macleay	Francis Clarke				Resigned to give Barton a seat	23 September 1898	Edmund Barton
	Sydney-Fitzroy	John McElhone			Independent Free Trade	Death	3 June 1898	John Norton		Protectionist
	Narrabri	Charles Collins			Free Trade	Death	3 June 1898	Hugh Ross		Labor
	Lachlan	James Carroll			Protectionist	Resignation due to insolvency	(11 September 1896)	James Carroll		Protectionist
	Cowra	Denis Donnelly			Protectionist	Death	27 March 1896	Michael Phillips		Protectionist
	Waverley	Angus Cameron			Free Trade	Death	18 February 1896	Thomas Jessep		Free Trade
	Sydney-Phillip	Dick Meagher			Protectionist	Resigned in disgrace in relation to the pardon of George Dean	17 October 1895	Henry Copeland		Protectionist
	Rylstone	John Fitzpatrick			Free Trade	Election result voided by the Elections and Qualifications Committee	14 October 1895	John Fitzpatrick		Free Trade
	Canterbury	Varney Parkes			Free Trade	Resignation due to insolvency	(14 June 1895)	Varney Parkes		Free Trade
	Bowral	William McCourt			Free Trade	Resignation due to insolvency	(19 February 1895)	William McCourt		Free Trade
	Boorowa	Thomas Slattery			Protectionist	Resigned	15 January 1895	Kenneth Mackay		Protectionist
	Willoughby	Joseph Cullen			Free Trade	Resignation due to insolvency	30 November 1894	Edward Clark		Free Trade
	Tweed	John Willard			Labor	Not a resident of NSW	29 November 1894	Joseph Kelly		Protectionist
	Grenfell	George Greene			Free Trade	Election result overturned by the Elections and Qualifications Committee (no by-election)	(25 October 1894)	Michael Loughnane		Labor
	Macleay	Otho Dangar			Protectionist	Financial difficulty	29 May 1893	Francis Clarke		Protectionist
	Central Cumberland	John Nobbs			Free Trade	Financial difficulty	6 May 1893	George McCredie		Free Trade
	Murrumbidgee	George Dibbs			Protectionist	Financial difficulty	(6 April 1893)	George Dibbs		Protectionist
	South Sydney	James Toohey			Protectionist	Resigned	13 February 1893	William Manning		Protectionist
	East Macquarie	James Tonkin			Free Trade	Financial difficulty	13 August 1892	James Tonkin		Free Trade
	Hawkesbury	Alexander Bowman			Free Trade	Death	23 July 1892	Sydney Burdekin		Free Trade
	Bogan	George Cass			Protectionist	Death	31 May 1892	William A'Beckett		Free Trade
	Bourke	Peter Howe			Protectionist	Resigned after conviction for conspiracy to defraud	4 December 1891	Thomas Waddell		Protectionist
Illawarra	John Nicholson			Labor	Previous result voided by the Elections and Qualifications Committee	3 October 1891	John Nicholson		Labor
Andrew Lysaght			Protectionist	Archibald Campbell			Free Trade
	Canterbury	John Wheeler			Free Trade	Election result overturned by the Elections and Qualifications Committee (no by-election)	(2 September 1891)	James Eve		Free Trade
	Central Cumberland	Robert Ritchie			Free Trade	Death	29 August 1891	Jacob Garrard		Free Trade
	Wellington	David Ferguson			Protectionist	Death	29 May 1891	Thomas York		Protectionist
	East Sydney	John Street			Free Trade	Death	14 April 1891	Walter Bradley		Protectionist
	Newcastle	James Fletcher			Protectionist	Death	14 April 1891	William Grahame		Protectionist
	West Macquarie	Paddy Crick			Protectionist	Expelled for outrageous behaviour in the chamber	6 December 1890	Paddy Crick		Protectionist
	West Sydney	Alfred Lamb			Free Trade	Death	25 October 1890	Adolphus Taylor		Independent
	Goulburn	William Teece Jr			Free Trade	Death	16 August 1890	Cecil Teece		Free Trade
	Namoi	Tom Dangar			Free Trade	Death	31 July 1890	Charles Collins		Free Trade
	Hartley	John Hurley			Free Trade	Financial difficulty	22 July 1890	John Hurley		Free Trade
Balmain	John Hawthorne			Free Trade	Financial Difficulty	(10 July 1890)	John Hawthorne		Free Trade
	Hastings and Manning	Charles Roberts			Free Trade	Resigned	5 April 1890	Walter Vivian		Free Trade
	Monaro	Harold Stephen			Protectionist	Death	17 December 1889	Gus Miller		Protectionist
Newcastle	William Grahame			Protectionist	Financial Difficulty	12 October 1889	James Curley		Free Trade
	Central Cumberland	Frank Farnell			Free Trade	Financial difficulty	(5 October 1889)	Frank Farnell		Free Trade
	Central Cumberland	John Linsley			Free Trade	Death	22 July 1889	David Dale		Free Trade
	Redfern	John Sutherland			Protectionist	Death	8 July 1889	William Schey		Protectionist
	Tamworth	Robert Levien			Protectionist	Sought a new mandate after being involved in a legal scandal	(18 June 1889)	Robert Levien		Protectionist
	Gunnedah	Thomas Goodwin			Protectionist	Resigned	12 September 1888	Edwin Turner		Free Trade
	Redfern	James Farnell			Free Trade	Death	8 September 1888	Peter Howe		Protectionist
	Central Cumberland	Andrew McCulloch			Free Trade	Financial difficulty	15 May 1888	David Buchanan		Protectionist
	Central Cumberland	Varney Parkes			Free Trade	Business commitments	14 March 1888	John Nobbs		Free Trade
	Newtown	William Foster			Free Trade	Accepted an appointment as a Judge of the Supreme Court	25 February 1888	Joseph Mitchell		Free Trade
	Newtown	Frederick Gibbes			Free Trade	Death	3 February 1888	Joseph Abbott		Free Trade
	Paddington	William Trickett			Free Trade	Appointed to Legislative Council	12 January 1888	William Allen		Protectionist
	Central Cumberland	Andrew McCulloch			Free Trade	Financial difficulty	28 December 1887	Andrew McCulloch		Free Trade
	St Leonards	Henry Parkes			Free Trade	Financial difficulty	(25 October 1887)	Henry Parkes		Free Trade
	Wentworth	William MacGregor			Independent Free Trade	Resigned	28 September 1887	Thomas Browne		Protectionist
	Mudgee	Adolphus Taylor			Free Trade	Accepted position as Examiner of Patents	11 May 1887	John Haynes		Free Trade

No party system was discernible in the New South Wales parliament before the election of 1887

NOTOC

By-election	Incumbent	Reason	Date	Winner	By-election	Incumbent
	Bourke	Russell Barton
William Sawers	Resigned	21 January 1887	Parliament dissolved before writ returned
	Kiama	Harman Tarrant	Resigned	13 January 1887	Angus Cameron
	New England	William Proctor	Resigned	10 January 1887	William Proctor
	Yass Plains	Louis Heydon	Retired	20 December 1886	Thomas Colls
	Wollombi	Lyall Scott	Retired (ill-health)	17 December 1886	Richard Stevenson
	Mudgee	John Robertson		Retired (ill-health, financial difficulties and loss of premiership)	(2 July 1886)	William Wall
	Gwydir	William Campbell	Resigned	10 June 1886	Thomas Hassall
	Young	William Watson	Election result overturned by the Qualifications Committee (no by-election)	(22 December 1885)	James MacKinnon
	Central Cumberland	John Lackey	Accepted nomination to the Legislative Council	24 September 1885	Varney Parkes.
	Canterbury	Henry Moses	Accepted nomination to the Legislative Council	16 September 1885	William Henson
	St Leonards	Bernhardt Holtermann	Death	4 June 1885	Isaac Ives
	Argyle	John Gannon	Resigned due to ill health	31 March 1885	Henry Parkes
	Carcoar	Andrew Lynch	Death	21 November 1884	Ezekial Baker
	Tenterfield	Henry Parkes	Resigned, claiming that he was retiring from politics	(24 November 1884)	Charles Lee
	Monaro	Robert Tooth	Resigned	(24 July 1884)	David Ryrie
	West Macquarie	Thomas Hellyer	Resigned	2 July 1884	Lewis Lloyd
	Northumberland	Atkinson Tighe	Resigned due to ill health	26 May 1884	Richard Luscombe
	Gundagai	Bruce Smith	Resigned	22 April 1884	James Watson
	Canterbury	William Pigott	Resigned (private work commitments)	19 April 1884	Mark Hammond
	East Sydney	George Reid	Found to have a position of profit under the crown	29 February 1884	Sydney Burdekin
	Bathurst	Francis Suttor	Found to have a position of profit under the crown	(11 February 1884)	Francis Suttor
	Glebe	George Allen	Prolonged voyage to England.	26 August 1883	Michael Chapman
	Upper Hunter	John McElhone	Challenged Adolphus Taylor to resign	6 March 1883	John McElhone
	Mudgee	Adolphus Taylor	Challenged by John McElhone to resign	6 March 1883	Adolphus Taylor
	East Sydney	John McElhone	Elected to two seats	23 January 1883	Henry Copeland
	Newtown	Henry Copeland	Ministerial (defeated)	13 January 1883	Joseph Mitchell
	Gundagai	William Forster	Death	23 November 1882	Bruce Smith
	Tumut	James Hoskins	Resigned to take a recuperative sea voyage	17 October 1882	Thomas O'Mara
	East Macquarie	Alfred Pechey	Death	11 July 1882	Sydney Smith
	Tenterfield	John Dillon	Resigned	6 February 1882	Augustus Fraser
	Wentworth	William Brodribb	Appointed to the Legislative Council	23 January 1882	Edward Quin
	East Macquarie	Edmund Webb	Appointed to the Legislative Council	19 January 1882	Alfred Pechey
	Northumberland	William Turner	Resigned (He was supported by the local coal miners union, however the subscriptions were insufficient to support him in the assembly)	18 January 1882	Thomas Hungerford
	Mudgee	Samuel Terry	Appointed to the Legislative Council	(20 January 1882)	John Robertson
	Redfern	John Sutherland	Appointed to the Legislative Council	11 January 1882	Francis Wright
	Yass Plains	Michael Fitzpatrick	Death	10 January 1882	Louis Heydon
	Argyle	Phillip G. Myers	Death	9 December 1881	John Gannon
	Newtown	Stephen Brown	Appointed to the Legislative Council	1 December 1881	Joseph Mitchell
	Carcoar	Ezekial Baker	Expelled after he had been found to have fraudulently dealt with trust funds	1 December 1881	George Campbell
	Queanbeyan	James Thompson	Resigned	21 January 1881	Thomas Rutledge
	Windsor	Richard Driver	Death	29 July 1880	Henry McQuade
	Illawarra	Samuel Gray	Resigned	7 July 1880	Alexander Stuart
	Kiama	Samuel Charles	Prolonged voyage to Europe	2 July 1880	Harman Tarrant
	Northumberland	Thomas Hungerford	Resigned (attend to personal business matters)	30 April 1880	Ninian Melville
	Clarence	Thomas Bawden	Resigned	7 April 1880	Charles Fawcett
	Paddington	John Sutherland	Resigned (company won government contract)	20 February 1880	William Hezlet
	East Sydney	Alexander Stuart	Accepted position as Agent-General in London	17 December 1879	Arthur Renwick
	University of Sydney	William Windeyer	Accepted an appointment as a Judge of the Supreme Court	26 August 1879	Edmund Barton
	East Macquarie	William Suttor, Jr.	Resigned	15 August 1879	Edward Combes
	Mudgee 2	Richard Rouse	Result overturned by the Qualifications Committee (no by-election)	(7 March 1879)	David Buchanan
	Orange	Edward Combes	Found to have an office of profit under the crown	4 March 1879	Andrew Kerr
	Mudgee	John Robertson	Appointed to the Legislative Council	6 January 1879	Richard Rouse
	East Maitland	Stephen Scholey	Death	5 June 1878	Henry Badgery
	East Macquarie	John Robertson	Elected to two seats,	1 February 1878	Edmund Webb
	Northumberland	Charles Stevens	Financial difficulties	20 July 1877	William Turner
	Orange	Harris Nelson	Resigned	(22 February 1877)	Edward Combes
	Williams	William Watson	Resigned	February 1877	William Johnston
	Mudgee	Stephen Goold	Death	5 October 1876	Richard Rouse
	University of Sydney		New seat	8 September 1876	William Windeyer
	Carcoar	Solomon Meyer	Resigned due to financial difficulties	(21 June 1876)	Andrew Lynch
	Liverpool Plains	Hanley Bennett	Financial difficulties	5 June 1876	Hanley Bennett
	Hartley	Thomas Browne	Found to have held a position of profit under the crown	21 April 1876	John Hurley
	Parramatta	Hugh Taylor	Resigned as he may have had a position of profit under the crown	20 April 1876	Hugh Taylor
	Murrumbidgee	William Forster	Accepted the position of Agent-General in London	(6 March 1876)	Joseph Leary
	Upper Hunter	Thomas Hungerford	By-election result voided by Qualifications Committee	5 August 1875	John McElhone
	Central Cumberland	Joseph Wearne	Financial difficulties	28 June 1875	William Long
	Upper Hunter	Francis White	Death	7 June 1875	Thomas Hungerford
	Paterson	William Arnold	Death	18 March 1875	Herbert Brown
	West Maitland	Benjamin Lee	Financial difficulties	4 August 1874	Lewis Levy
	East Sydney	James Neale	Resigned	15 July 1874	Charles Moore
	East Macquarie	James Martin	Accepted appointment as Chief Justice	1 December 1873	Walter Cooper
	Mudgee	Joseph Innes	Appointed to the Legislative Council	8 September 1873	Joseph O'Connor
	Hume	James McLaurin	Resigned	31 March 1873	Thomas Robertson
	Murray	Patrick Jennings	Resigned	5 August 1872	William Hay
	East Sydney	Saul Samuel	Appointed to the Legislative Council	12 June 1872	George Oakes
	Parramatta	Hugh Taylor	Disqualified himself at the declaration of the poll as he had a position of profit under the crown	(22 May 1872)	Hugh Taylor
	Mudgee	Henry Stephen	Resigned	2 January 1872	Henry Parkes
	New England	Charles Weaver	Resigned	28 August 1871	Samuel Terry
	Shoalhaven	Thomas Garrett	Accepted the position of Police Magistrate at Berrima	(28 August 1871)	James Warden
	Liverpool Plains	Charles Cowper	Accepted the position of Agent-General in London	9 January 1871	Lewis Levy
	Kiama	Henry Parkes	Financial difficulties	(12 January 1871)	John Stewart
	Canterbury	Montagu Stephen	Prolonged visit to England	6 January 1871	John Lucas
	Goldfields South	Ezekiel Baker	Accepted appointment to the Goldfields Royal Commission	12 December 1870	Ezekiel Baker
	Monaro	Daniel Egan	Death	17 November 1870	James Hart
	Kiama	Henry Parkes	Financial difficulties	3 November 1870	Henry Parkes
	Braidwood	Michael Kelly	Result voided due to electoral irregularities	17 October 1870	Edward Greville
	Hastings	Horace Dean	Election overturned as not a British subject (no by-election)	(4 July 1870)	Robert Smith
	Wollombi	Joseph Eckford	Financial difficulties	19 September 1870	Joseph Eckford
	Hastings	Horace Dean	Found to have held an office of profit under the crown	4 July 1870	Horace Dean
	Goldfields South	Ezekiel Baker	Resigned	(11 July 1870)	Ezekiel Baker
	Goldfields North	Robert Wisdom	Elected to two seats	18 April 1870	Robert Forster
	West Sydney	John Robertson	Financial difficulties	2 March 1870	John Robertson
	East Sydney	Henry Parkes	Elected to two seats	23 February 1870	Bowie Wilson
	Braidwood	Joshua Josephson	Accepted an appointment as a Judge of the District Court	(25 September 1869)	Michael Kelly
	Goldfields West	George Thornton	Prolonged trip to England	15 February 1869	Walter Church
	Central Cumberland	Allan Macpherson	Cause of resignation is unknown	17 December 1868	Samuel Lyons
	West Sydney	Samuel Joseph	Prolonged trip to England	15 December 1868	William Campbell
	Canterbury	James Pemell	Cause of resignation is unknown	(19 September 1868)	Richard Hill
	Goldfields North	George Pickering	Cause of resignation is unknown	6 July 1868	James Hoskins
	Upper Hunter	James White	Prolonged trip to England	6 June 1868	Archibald Bell
	East Macquarie	David Buchanan	Traveled to England to study for the bar	26 August 1867	John Suttor
	Orange	William Forlonge	Financial Difficulty	1 July 1867	George McKay
	Central Cumberland	John Hay	Appointed to the Legislative Council	27 June 1867	John Lackey
	East Sydney	Charles Cowper	Financial Difficulty	20 March 1867	Marshall Burdekin
	Goldfields West	Stephen Donnelly	Cause of resignation is unknown	26 February 1867	George Thornton
	Bathurst	James Kemp	Cause of resignation is unknown	(24 December 1866)	William Suttor
	East Sydney	John Caldwell	Financial Difficulty	(24 September 1866)	Robert Stewart
	Illawarra	Patrick Osborne	Prolonged trip to England	6 September 1866	John Stewart
	Clarence	John Laycock	Cause of resignation is unknown	27 August 1866	John Robertson
	Tumut	Charles Cowper Jr.	Absent from parliament without leave	20 August 1866	Edward Brown
	Williams 2	Frederick Manton	Financial Difficulty	19 April 1866	John Nowlan
	Williams 1	Marshall Burdekin	Ministerial by-election	22 January 1866	Frederick Manton
	West Sydney	John Robertson	Ministerial by-election	17 January 1866	William Windeyer
	Yass Plains	Peter Faucett	Accepted an appointment as a Judge of the Supreme Court	(6 November 1865)	Robert Isaacs
	West Sydney 3	John Robertson	Financial Difficulty	(20 October 1865)	John Robertson
	West Sydney 2	John Darvall	Retired to England	7 July 1865	Geoffrey Eagar
	Gwydir	Tom Dangar	Position of profit under the crown	29 June 1865	Tom Dangar
	Monaro	James Martin	Elected to two seats	(10 April 1865)	William Grahame
	Canterbury	John Lucas	Elected to two seats	24 February 1865	James Pemell
	East Macquarie	William Suttor	Resigned	6 October 1864	David Buchanan
	Kiama	Samuel Gray	Resigned	29 April 1864	Henry Parkes
	Braidwood	Merion Moriarty	Death	3 February 1864	Henry Milford
	Tumut	Charles Cowper, Jr.	Resigned to oppose Martin in Ministerial by-election	16 November 1863	James Martin
	Orange	James Martin	Ministerial – Premier (defeated)	4 November 1863	Charles Cowper, Jr.
	Clarence	Clark Irving	Absent for entire session without leave	23 July 1863	Clark Irving
	East Maitland	James Dickson	Death	18 June 1863	John Darvall
	Central Cumberland	James Atkinson	Resigned (Ill health)	6 June 1863	Allan Macpherson
	Goldfields North	James Hoskins	Accepted position as overseer of northern roads	7 April 1863	James Buchanan
	Liverpool Plains	Alexander Dick	Resigned	29 January 1863	Marshall Burdekin
	West Sydney	William Windeyer	Resigned (Ill health after being shipwrecked)	8 January 1863	Geoffrey Eagar
	Northumberland	Thomas Lewis	Financial difficulty	23 December 1862	Atkinson Tighe
	Argyle	Terence Murray	Appointed to the Legislative Council	(30 October 1862)	Samuel Emmanuel
	Carcoar	William Watt	Resigned	(16 October 1862)	William Dalley
	Morpeth	David Buchanan	Financial difficulty	18 September 1862	Edward Close
	Orange	John Peisley	Resigned	28 June 1862	James Martin
	New England	George Markham	Resigned	2 April 1862	Robert Forster
	Wellington	Silvanus Daniel	Resigned	(26 February 1862)	Saul Samuel
	Shoalhaven	John Garrett	Resigned	(7 January 1862)	John Robertson
	Tenterfield	Robert Meston	Resigned	3 December 1861	Hugh Gordon
	Yass Plains	Henry O'Brien	Resigned (Ill health)	(15 August 1861)	Peter Faucett
	Camden	John Douglas	Resigned to move to Queensland	(15 August 1861)	David Bell
	Hunter	Isidore Blake	Accepted an appointment as a Judge of the District Court	5 August 1861	John Burns
	Lower Hunter	Alexander Scott	Appointed to the Legislative Council	19 July 1861	Richard Sadleir
	Newtown	Alexander McArthur	Appointed to the Legislative Council	12 July 1861	Thomas Holt
	Patrick's Plains	William Lesley	Resigned	(4 July 1861)	Joseph Harpur
	Goulburn	Charles Walsh	Resigned as he had achieved his aims of land and Legislative Council reform	13 June 1861	Maurice Alexander
	East Sydney	Henry Parkes	Accepted position as immigration promoter in England	29 May 1861	William Forster
	Upper Hunter	John Robertson	Appointed to the Legislative Council	15 April 1861	Thomas Dangar
	Parramatta	James Byrnes	Resigned (unhappy that he was the second member elected for the seat)	10 April 1861	Arthur Holroyd
	Tumut	Daniel Deniehy	Elected to two seats and previous by-election voided due to voting irregularities	(1 November 1860)	Charles Cowper, Jr.
	Braidwood	Frederick Cooper	Resigned	10 August 1860	Merion Moriarty
	Morpeth	Edward Close	Resigned	7 August 1860	Samuel Cohen
	Wellington	Nicolas Hyeronimus	Death	26 July 1860	Silvanus Daniel
	Wollombi	William Cape	Resigned	17 May 1860	Joseph Eckford
	Tumut	George Lang	Resigned (political ennui)	10 May 1860	Daniel Deniehy
	East Macquarie	Thomas Hawkins	Resigned	10 May 1860	Daniel Deniehy
	St Leonards	Edward Sayers	Resigned	2 May 1860	James Farnell
	Hunter	Richard Jones	Resigned	(23 April 1860)	Isidore Blake
	Liverpool Plains	Andrew Loder	Resigned after the defeat of the Foster Government	10 April 1860	Charles Kemp
	Windsor	William Dalley	Prolonged visit to Europe resulting by-election	12 March 1860	William Walker
	Williams	Stephen Dark	Resigned	16 February 1860	Alexander Campbell
	Canterbury	Edward Flood	Resigned	4 February 1860	John Lucas
	East Sydney	Charles Cowper	Was nominated and elected without his consent at previous by-election	20 January 1860	Peter Faucett
	West Macquarie	John McPhillamy	Resigned	(21 December 1859)	Henry Mort
	Mudgee	Lyttleton Bayley	Resigned after losing ministerial post	19 December 1859	Samuel Terry
	East Sydney	Charles Cowper	Resigned (Ill health)	10 November 1859	Charles Cowper
	Illawarra	John Hargrave	Appointed to Legislative Council	28 October 1859	Samuel Gordon
	East Macquarie	William Suttor	Resigned	6 October 1859	Thomas Hawkins
	Yass Plains	Thomas Laidlaw	Found to have a position of profit under the crown	(15 September 1859)	Thomas Laidlaw
	East Maitland	Joseph Chambers	Appointed Crown Prosecutor	15 September 1859	James Dickson
	East Camden	Robert Owen	Accepted an appointment as a Judge of the District Court	21 March 1859	John Hargrave
	New England and Macleay	Abram Moriarty	Resigned	(26 November 1858)	James Hart
	Cumberland (North Riding)	Henry Parkes	Financial difficulties	(13 September 1858)	John Plunkett
	Moreton, Wide Bay, Burnett and Maranoa	Gordon Sandeman	Resigned	(19 November 1857)	Patrick Leslie
	Cumberland (North Riding)	John Darvall	Resigned	11 December 1857	Thomas Smith
	Northumberland Boroughs	George Nichols	Death	(3 November 1857)	James Dickson
	Cumberland (South Riding)	William Manning	Resigned	12 June 1857	James Byrnes
	Argyle	John Plunkett	Appointed to the Legislative Council	(13 February 1857)	Daniel Deniehy
	Sydney City	Henry Parkes	Financial difficulties	29 December 1856	William Dalley
	Cumberland (South Riding)	Ryan Brenan	Result voided by the Elections and Qualifications Committee	(4 November 1856)	Stuart Donaldson
	Sydney Hamlets	Stuart Donaldson	Ministerial (defeated)	10 October 1856	John Campbell
	Cumberland (South Riding)	Elias Weekes	Elected for two seats	21 August 1856	Ryan Brenan
	Northumberland Boroughs	Bourn Russell	Result overturned by Qualifications Committee (no by-election)	(5 August 1856)	Elias Weekes
	Bathurst County	John Plunkett	Elected for two seats	19 June 1856	William Suttor
	Western Division of Camden	James Macarthur	Believed poll to be unconstitutional	(16 June 1856)	James Macarthur

Causes

A by-election may occur whenever there is a vacancy in the Legislative Assembly. Vacancies can occur for reasons including:

Death
Voluntary resignation for any reason; historically these reasons have included:
- Retirement
- Health issues
- Family or business commitments
- Prolonged absence from the state—this occurred most commonly in the period when travel to Europe required a long sea voyage
- Loss of cabinet position, e.g., the resignation of Reba Meagher in 2008 after she lost the position of Minister for Health
- Matters of principle, e.g., Billy Dunn resigned from the seat of Mudgee in 1911 after disagreeing with his party's land ownership legislation.
- Resignation or expulsion from a political party
- To create a vacancy for a party leader who did not have a seat. This occurred most recently in 1986 when Rockdale MLA Brian Bannon resigned to enable newly elected party leader Barrie Unsworth to transfer from the Legislative Council to the Legislative Assembly.
- Public disgrace
- As a result of an inducement from an opposing party and thus create the potential for that party to increase its representation e.g. Independent MLA Alick Kay accepted an appointment to the Metropolitan Meat Board in 1927. Under a controversial use of the Legislative Assembly (Casual Vacancies) Act, he was replaced by Labor's Arthur Tonge; this gave the government of Jack Lang a secure majority in the house.
Constitutional ineligibility to be a Member of the Legislative Assembly, including:
- Election result voided or overturned on appeal—appeals were initially made to the Qualifications Committee of the Assembly but since 1928 they have been determined by the Court of Disputed Returns
- Election to two seats—in which case the member was required to resign from one seat
- Appointment or election to the Legislative Council This occurred most commonly prior to 1936, when members of the council were appointed for life by the governor
- Election to another parliament, particularly federal parliament—members are required to resign prior to the issuing of the writs for the other parliament's election
- Having or accepting a position of profit under the crown
- Not being a citizen of Australia
- Non-residence in New South Wales for more than 6 months prior to election
- Becomes of "unsound mind"
- Insolvency
- Conviction for a major criminal offence or, since 2007, having faced trial on a charge of sexual abuse of a minor
- Absence from the house for an entire session without leave
- Expulsion from the house for infamous conduct
- Ministerial appointment Until 1904, members appointed to a ministerial position were required to face a by-election. These were generally uncontested. The political instability of New South Wales in the Nineteenth century caused a very large number of these by-elections and for convenience they have not been listed unless the minister was defeated.

It is now a convention that a by-election is not held if a vacancy occurs within 3–4 months of an expected dissolution of the parliament.

Notes

References

"Former members of the Parliament of New South Wales". Parliament of New South Wales.
(October 2021). "'Devastated' locals leave notes, flowers for Gladys Berejiklian at Willoughby office and home after shock resignation".
(1920). "1921 Sturt by-election".
(1859). "1860 Tumut by-election".
{{NSW Parliamentary Record
{{Cite NSW Parliament

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