This is a list of WBO world champions, showing every world champion certified by the World Boxing Organization (WBO). The WBO is one of the four major governing bodies in professional boxing, and has awarded world championships in 17 different weight classes since 1989.
Boxers who won the title but were stripped due to the title bout being overturned to a no contest are not listed.
Stand: March 6, 2025.
r – Champion relinquished title.
s – Champion stripped of title.
Atomweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | JPN Nao Ikeyama | 17 May 2014 — 29 Jul 2018 | 6 |
| 2 | JPN Mika Iwakawa | 29 Jul 2018 — 25 Feb 2022 | 1 |
| 3 | JPN Nanae Suzuki | 25 Feb 2022 — 1 Sep 2022 | 0 |
| 4 | JPN Yuko Kuroki | 1 Sep 2022 — 12 Jan 2024 | 2 |
| 5 | JPN Eri Matsuda | 12 Jan 2024 — 23 Nov 2024 | 0 |
| 6 | GER Tina Rupprecht | 23 Nov 2024 — Oct 2025r | 1 |
| 7 | ROM Gabriela Timar | 26 Dec 2025 — present | 0 |
Mini flyweight
| No. | Name | Duration of reign | Defences | Yamada submitted a retirement notification to the Japanese Boxing Commission on 31 May 2014. The belt was vacated on the same day. | Ikehara retired from professional competition on 13 December 2016 | Tada vacated the title on 28 March 2019, as she intended to move up to minimumweight. | Saeki vacated the title, for undisclosed reasons, on 18 December 2019. | Estrada announced her retirement from the sport on 23 October 2024. |
|---|
| 1 | THA Teeraporn Pannimit | 2 Apr 2010 — 2011s | 1 | | | | | |
| 2 | THA Teeraporn Pannimit (2) | 25 Apr 2012 — 28 Jun 2012 | 0 | | | | | |
| 3 | KOR Hong Su-yun | 28 Jun 2012 — 9 Feb 2014 | 2 | | | | | |
| 4 | JPN Mako Yamada | 9 Feb 2014 — 31 May 2014s | 0 | | | | | |
| 5 | JPN Kumiko Seeser Ikehara | 20 Sep 2014 — 13 Dec 2016r | 4 | | | | | |
| 6 | JPN Kayoko Ebata | 19 May 2017 — 1 Dec 2018 | 1 | | | | | |
| 7 | JPN Etsuko Tada | 1 Dec 2018 — 28 Mar 2019r | 0 | | | | | |
| 8 | JPN Kasumi Saeki | 27 Apr 2019 — 2019r | 0 | | | | | |
| 9 | JPN Etsuko Tada (2) | 3 Dec 2020 — 23 Oct 2021 | 0 | | | | | |
| 10 | VIE Nguyễn Thị Thu Nhi | 23 Oct 2021 — 8 Sep 2022 | 0 | | | | | |
| 11 | CRI Yokasta Valle | 8 Sep 2022 — 29 Mar 2024 | 3 | | | | | |
| 12 | USA Seniesa Estrada | 29 Mar 2024 — 23 Oct 2024r | 0 | | | | | |
| 13 | GER Sarah Bormann | 14 Dec 2024 — present | 2 | | | | | |
Junior flyweight
| No. | Name | Duration of reign | Defences | Hye Lee was stripped of her title on 1 June 2016, as she failed to make a title defense in the mandated time frame. | Hawton vacated her title in early 2017, in order to move down to atomweight. | Fujioka vacated the title on 11 December 2017, to focus on defending her WBA light flyweight championship. |
|---|
| 1 | ARG Yésica Bopp | 6 Nov 2009 — 2015s | 12 | | | |
| 2 | KOR Eun Hye Lee | 29 Sep 2015 — 1 Jun 2016s | 0 | | | |
| 3 | AUS Louisa Hawton | 20 Aug 2016 — 2017r | 0 | | | |
| 4 | KOR Hong Su-yun | 14 May 2017 — 16 Jul 2017s | 0 | | | |
| 5 | JPN Naoko Fujioka | 1 Dec 2017 — 11 Dec 2017r | 0 | | | |
| 6 | JPN Tenkai Tsunami | 8 Mar 2018 — 9 Jul 2021 | 4 | | | |
| 7 | USA Seniesa Estrada | 9 Jul 2021 — 2022v | 0 | | | |
| 8 | ARG Evelyn Nazarena Bermúdez | 26 Mar 2022 — 26 Nov 2022 | 1 | | | |
| 9 | CRC Yokasta Valle | 26 Nov 2022 — 2023v | 0 | | | |
| 9 | ARG Evelyn Nazarena Bermúdez (2) | 10 Mar 2023 — present | 4 | | | |
Flyweight
| No. | Name | Duration of reign | Defences | Muciño was stripped of her title on 29 July 2019, as she was unable to make a defense due to an ankle injury sustained in a car crash. | Adams retired from professional competition on 6 November 2019, after sustaining an eye injury in a fight. |
|---|
| 1 | DEU Susi Kentikian | 10 Oct 2009 — 16 May 2012 | 3 | | |
| 2 | USA Melissa McMorrow | 16 May 2012 — 2014s | 2 | | |
| 3 | ARG Yésica Bopp | 26 Apr 2014 — 2014r | 0 | | |
| 4 | MEX Kenia Enríquez | 21 Nov 2014 — 28 Feb 2015 | 0 | | |
| 5 | USA Melissa McMorrow (2) | 28 Feb 2015 — 2016s | 0 | | |
| 6 | JPN Nana Nogami | 9 Oct 2016 — 29 Apr 2017 | 0 | | |
| 7 | MEX Monserrat Alarcón | 29 Apr 2017 — 17 Feb 2018 | 0 | | |
| 8 | MEX Arely Muciño | 17 Feb 2018 — 29 Jul 2019s | 2 | | |
| 9 | GBR Nicola Adams — Interim Champion since 6 October 2018, elevated to regular champion | 29 Jul 2019 — 6 Nov 2019r | 1 | | |
| 10 | ARG Débora Anahí López | 20 Dec 2019 — 19 Mar 2022 | 1 | | |
| 11 | ARG Tamara Elisabet DeMarco | 19 Mar 2022 — 18 Jun 2022 | 0 | | |
| 12 | ARG Gabriela Celeste Alaniz | 18 Jun 2022 — 8 Jul 2023 | 1 | | |
| 13 | USA Marlen Esparza | 8 Jul 2023 — 26 Apr 2024s | 0 | | |
| 14 | ARG Gabriela Celeste Alaniz (2) | 27 Apr 2024 — 2 Nov 2024 | 0 | | |
| 15 | USA Gabriela Fundora | 2 Nov 2024 — present | 2 | | |
Junior bantamweight
| No. | Name | Duration of reign | Defences | Duer vacated her title on 26 July 2013, after capturing a WBO championship a weight class up. | Ozawa vacated her title on 27 October 2022, to focus on her family life. |
|---|
| 1 | ARG Carolina Duer | 17 Dec 2010 — 26 Jul 2013r | 6 | | |
| 2 | ARG Daniela Romina Bermúdez | 4 Jan 2014 — 2017r | 4 | | |
| 3 | DEU Raja Amasheh | 10 Mar 2018 — 2019s | 1 | | |
| 4 | PRI Amanda Serrano | 18 Jan 2019 — 2019r | 0 | | |
| 5 | JPN Miyo Yoshida | 19 Jun 2019 — 13 Dec 2020 | 1 | | |
| 6 | JPN Tomoko Okuda | 13 Dec 2020 — 29 Jun 2021 | 0 | | |
| 7 | JPN Miyo Yoshida (2) | 29 Jun 2021 — 30 May 2022 | 0 | | |
| 8 | JPN Tamao Ozawa | 30 May 2022 — 27 Oct 2022 | 0 | | |
| 9 | JPN Mizuki Hiruta | 1 Dec 2022 — present | 5 | | |
Bantamweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | USA Kaliesha West | 18 Sep 2010 — 2012r | 3 |
| 2 | ARG Daniela Romina Bermúdez | 31 May 2013 — 2013r | 0 |
| 3 | ARG Carolina Duer | 26 Jul 2013 — 2015s | 2 |
| 4 | ARG Mayra Alejandra Gómez — Interim champion, elevated to full champion 10 February 2015 | 10 Feb 2015 — 2015s | 1 |
| 5 | JPN Naoko Fujioka | 19 Oct 2015 — 2016s | 1 |
| 6 | ARG Sabrina Maribel Pérez | 26 Nov 2016 — 2017r | 0 |
| 7 | PRI Amanda Serrano | 22 Apr 2017 — 2017r | 0 |
| 8 | ARG Daniela Romina Bermúdez (2) | 20 Oct 2017 — Dec 2020r | 5 |
| 9 | DEN Dina Thorslund | 25 Jun 2021 – Jun 6, 2025r | 7 |
| 10 | AUS Cherneka Johnson | 11 Jul 2025 – present | 0 |
Junior featherweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | USA Ana Julaton | 4 Dec 2009 — 2010s | 0 |
| 2 | USA Ana Julaton (2) | 30 Jun 2010 — 16 Mar 2012 | 2 |
| 3 | ARG Yésica Marcos — Interim champion since 8 October 2011, beat Julaton for full title 16 March 2012 | 16 Mar 2012 — 2013s | 2 |
| 4 | ARG Marcela Acuña | 25 Oct 2013 — 2016s | 2 |
| 5 | ARG Sabrina Maribel Pérez – Interim champion, elevated to full champion 10 May 2016. | 10 May 2016 — 2016s | 0 |
| 6 | PRI Amanda Serrano | 18 Oct 2016 — 2018r | 2 |
| 7 | ARG Daniela Romina Bermúdez | 13 Apr 2018 — 2018r | 0 |
| 8 | DEN Dina Thorslund | 25 Aug 2018 — 2021r | 3 |
| 9 | FRA Ségolène Lefebvre | 20 Nov 2021 – 2021r | 1 |
| 10 | ARG Débora Dionicius | 23 Dec 2022 – 29 Apr 2023 | 0 |
| 11 | FRA Ségolène Lefebvre (2) | 29 Apr 2023 – 13 Apr 2024 | 1 |
| 12 | GBR Ellie Scotney | 13 Apr 2024 – present | 1 |
Featherweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | DEU Ina Menzer | 10 Oct 2009 – 3 Jul 2010 | 1 |
| 2 | CAN Jeannine Garside | 3 Jul 2010 – 2011s | 0 |
| 3 | ARG Alejandra Oliveras | 5 Jan 2012 – 2014s | 5 |
| 4 | PRI Amanda Serrano | 17 Feb 2016 – 2016r | 1 |
| 5 | PRI Cindy Serrano | 10 Dec 2016 – 2018r | 1 |
| 6 | USA Heather Hardy | 27 Oct 2018 – 13 Sep 2019 | 0 |
| 7 | PRI Amanda Serrano (2) (elevated to Super champion on 19 Feb 2020) | 13 Sep 2019 – present | 7 |
Junior lightweight
| No. | Name | Duration of reign | Defences | Brodnicka was stripped of her title on 30 October 2020, after failing to make weight for the fight with Mikaela Mayer. |
|---|
| 1 | DEU Ramona Kühne | 4 Jun 2010 – 2018s | 8 | |
| 2 | POL Ewa Brodnicka – Interim champion since 13 May 2017, elevated to full champion | 22 Feb 2018 – 30 Oct 2020s | 5 | |
| 3 | US Mikaela Mayer | 31 Oct 2020 – 15 Oct 2022 | 3 | |
| 4 | US Alycia Baumgardner | 15 Oct 2022 – present | 3 | |
Lightweight
| No. | Name | Duration of reign | Defences | Taylor vacated the title on 5 January 2024 to concentrate on defending her undisputed junior-welterweight/super-lightweight championships. |
|---|
| 1 | AUS Erin McGowan | 9 Oct 2010 – 2011s | 0 | |
| 2 | COL Enis Pacheco | 16 Mar 2012 – 14 Jun 2013 | 2 | |
| 3 | ARG María Maderna | 14 Jun 2013 – 15 Aug 2014 | 3 | |
| 4 | PRI Amanda Serrano | 15 Aug 2014 – 2015s | 0 | |
| 5 | ARG Yohana Alfonzo | 24 Sep 2015 – 2017s | 3 | |
| 6 | BRA Rose Volante | 22 Dec 2017 – 15 Mar 2019 | 2 | |
| 7 | IRL Katie Taylor | 15 Mar 2019 – 5 Jan 2024r | 8 | |
| 8 | GBR Rhiannon Dixon | 13 Apr 2024 – 28 Sep 2024 | 0 | |
| 9 | GBR Terri Harper | 28 Sep 2024 – present | 1 | |
Junior welterweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | ARG Fernanda Alegre | 3 Dec 2010 – 2015s | 10 |
| 2 | ARG Fernanda Alegre (2) | 25 Apr 2015 – 2016r | 1 |
| 3 | ARG Adela Celeste Peralta | 14 May 2016 – 4 Nov 2016 | 0 |
| 4 | ARG Ana Esteche | 4 Nov 2016 – 2017s | 1 |
| 5 | PRI Amanda Serrano | 8 Sep 2018 – 2018r | 0 |
| 6 | GRE Christina Linardatou | 24 Mar 2019 – 2 Nov 2019 | 1 |
| 7 | IRE Katie Taylor | 2 Nov 2019 – 2019r | 0 |
| 8 | GRE Christina Linardatou (2) | 8 Feb 2020 – 2021r | 0 |
| 9 | US Kali Reis | 19 Nov 2021 – 2021r | 0 |
| 10 | UK Chantelle Cameron | 5 Nov 2022 – 25 Nov 2023 | 1 |
| 11 | IRE Katie Taylor (2) | 25 Nov 2023 – present | 2 |
Welterweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | CRI Hanna Gabriels | 19 Dec 2009 – 2010r | 0 |
| 2 | NOR Cecilia Brækhus | 15 May 2010 – 15 Aug 2020 | 21 |
| 3 | USA Jessica McCaskill | 15 Aug 2020 – 2023r | 3 |
| 4 | GBR Sandy Ryan | 22 Apr 2023 – 27 Sep 2024 | 2 |
| 5 | USA Mikaela Mayer | 27 Sep 2024 – present | 1 |
Junior middleweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | CRI Hanna Gabriels | 29 May 2010 – 28 Feb 2013 | 3 |
| 2 | DOM Oxandia Castillo | 28 Feb 2013 – 2014s | 0 |
| 3 | CRI Hanna Gabriels (2) | 20 Dec 2014 – 2018s | 4 |
| 4 | USA Claressa Shields | 10 Jan 2020 – 26 Nov 2021v | 1 |
| 5 | GBR Natasha Jonas | 19 Feb 2022 – 2023v | 2 |
| 6 | SVN Ema Kozin | 18 Nov 2023 – 4 Oct 2025 | 1 |
| 7 | NOR Cecilia Brækhus | 4 Oct 2025 – 4 Oct 2025v | 0 |
| 8 | USA Mikaela Mayer | 30 Oct 2025 – present | 0 |
Middleweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | DEU Christina Hammer | 23 Oct 2010 – 13 Apr 2019 | 12 |
| 2 | USA Claressa Shields Super champion since 8 July 2019 | 13 Apr 2019 – Sep 2020 | 0 |
| 3 | UK Savannah Marshall | 31 Oct 2020 – 15 Oct 2022 | 3 |
| 4 | USA Claressa Shields (2) | 15 Oct 2022 – 2025s | 1 |
| 5 | AUS Desley Robinson | 11 Apr 2025 — present | 1 |
Super middleweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | DEU Christina Hammer | 4 May 2013 – 2013r | 0 |
| 2 | BEL Femke Hermans | 12 May 2018 – 2018s | 0 |
| 3 | USA Franchón Crews-Dezurn | 14 Sep 2019 – 1 Jul 2023 | 2 |
| 4 | GBR Savannah Marshall | 1 Jul 2023 – 2024s | 0 |
| 5 | USA Shadasia Green | 15 Nov 2024 – present | 0 |
Light heavyweight
| No. | Name | Duration of reign | Defences | {{small | Peres retired from professional competition on 26 January 2021.{{cite web | url=https://www.newzealandfighter.co.nz/news/geovana-peres-announces-her-retirement | title=GEOVANA PERES ANNOUNCES HER RETIREMENT | Shields vacated her light heavyweight title while holding on to her heavyweight belt on 3 Mar 2025. |
|---|
| 1 | NZL Geovana Peres | 30 Mar 2019 – 26 Jan 2021r | 1 | | |
| date= | accessdate=26 January 2021}}}} | | | | | |
| 2 | USA Claressa Shields | 27 Jul 2024 – 3 Mar 2025s | 0 | | |
Heavyweight
| No. | Name | Duration of reign | Defences |
|---|
| 1 | USA Claressa Shields | 2 Feb 2025 – present | 1 |