FL

FL or variations may refer to:

Places

• Florida (United States postal abbreviation)
• Fort Lauderdale, Florida, a city in Florida, United States
• Fürstentum Liechtenstein (Principality of Liechtenstein)

Businesses and organizations

• AirTran Airways (IATA airline code)
• FL Group, an Icelandic investment company with an emphasis on flight and tourism industry
• Foot Locker, Inc. (ticker symbol)
• The Football League in England

Measures

• Femtolitre, a metric unit of volume
• Foot-lambert, a unit of luminance
• Flawless, a grade of diamond clarity
• Flight level, a standard nominal altitude of an aircraft, in hundreds of feet
• Fork length, a standard fish measurement
• Forestay length, in sailing
• Denotes "fluid" in fluid ounce (fl oz)!

Mathematics and computing

• FL (complexity), a class of functions in complexity theory
• FL (programming language)
• Adobe Flash Professional, software which uses "Fl" as its icon abbreviation
• FL Studio, a music production software program
• Freelancer (computer game)
• Friedmann–Lemaître metric in cosmology

Numismatics

• Florin, various coins
• Guilder, various coins also sometimes called florin

Other

• Liechtenstein (International license plate code)
• Fastest lap, in motorsports, the quickest single trip around the track by any driver during a race
• FetLife, a social networking site for people interested in BDSM, fetishism and kink
• Foreign language, a human language not spoken in one's native country
• The Flaming Lips, an American rock band
• Freelancer, a self-employed professional
• floruit (Latin, "flourished"), used to indicate periods when a person, organization, or species was influential
• fl (fl), a common typographical ligature
• Fluorouracil (5-FU) and leucovorin (folinic acid), a chemotherapy regimen for treating colon cancer
• Follicular lymphoma in medicine
• Fluffy transcription factor
• FLT3LG (Fms-related tyrosine kinase 3 ligand), a protein
• Federal League, a United States baseball league in 1914
• Floor, storey, referring to the floor number in a building
• Flavius, a gens (family name) or praenomen (personal name) in ancient Rome
• Flagship Lounge, the first class lounge of American Airlines
• Flerovium, chemical element 114