FL

FL or variations may refer to:

• FL, IATA code of Fly Lili, a Romanian airline

• FL, then-IATA code of AirTran Airways, a former American airline

• FL Group, an Icelandic investment company

• Foot Locker (ticker symbol), retailer

• Florin (disambiguation), various coins

• Guilder, various coins also sometimes called "florin"

• FL, the United States Postal Service for abbreviation for the state of Florida

• Liechtenstein, as abbreviation for Fürstentum Liechtenstein.

• Feminization laryngoplasty, gender-affirming surgery to raise the pitch of the voice

• FLT3LG (Fms-related tyrosine kinase 3 ligand), a protein

• Fluffy transcription factor, gene of Neurospora crassa

• Fluorouracil (5-FU), and leucovorin (folinic acid), a chemotherapy regimen

• Follicular lymphoma in medicine

• Frontal lobe, the largest brain lobe

• FL (complexity), a class of functions

• FL (programming language)

• FL Studio, music production software

• Femtolitre, a unit of volume

• Flerovium, symbol Fl, a chemical element (atomic number 114)

• Flight level, of an aircraft

• "Fluid", as in fluid ounce (fl oz)

• Foot-lambert, a unit of luminance

• Friedmann–Lemaître metric in cosmology

• Federal League, a 1914–1915 US baseball league

• English Football League

• Floruit (abbreviated fl.), a date when someone was active

• fl, a typographical ligature

• Flavius, a family or personal name in ancient Rome

• Flawless, a grade of diamond clarity

• Fork length, a standard fish measurement

• Free List (Liechtenstein), a political party

• Volvo FL, a truck

• Front Left speaker in 5.1 surround sound

• FLS (disambiguation)