FL or variations may refer to:
Businesses and organizations FL, IATA code of Fly Lili (founded 2021), a Romanian airline FL, IATA code of AirTran Airways (1993–2014), a former American airline FL Group, an Icelandic investment company Foot Locker (NYSE ticker symbol), retailer
Numismatics Florin (disambiguation), various coins Guilder, various coins also sometimes called "florin"
Places FL, the United States Postal Service abbreviation for the state of Florida FL, an abbreviation for , a country in Europe
Science and technology Biology and medicine Feminization laryngoplasty, gender-affirming surgery to raise the pitch of the voice FLT3LG (Fms-related tyrosine kinase 3 ligand), a protein Fluffy transcription factor, an asexual sporulation gene of Neurospora crassa Fluorouracil (5-FU), and leucovorin (folinic acid), a chemotherapy regimen Follicular lymphoma, a type of cancer Frontal lobe, a part of the brain
Mathematics and computing FL (complexity), a class of function problems FL (programming language), created at IBM in the 1980s FL Studio, music production software
Other uses in science and technology 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
Sport Federal League, a 1913–1915 US baseball league English Football League
Genealogy Floruit (abbreviated fl.), a prefix for the time period during which someone was active
Other uses , 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
See also FLS (disambiguation)