FL
- 5.1 surround sound
- AirTran Airways
- Chemotherapy regimen
- English Football League
- FL (complexity)
- FL (programming language)
- FL Group
- FL Studio
- FLS (disambiguation)
- FLT3LG
- Federal League
- Femtolitre
- Flavius
- Flerovium
- Flight level
- Florida
- Florin (disambiguation)
- Floruit
- Fluffy transcription factor
- Fly Lili
- Follicular lymphoma
- Foot Locker
- Foot-lambert
- Free List (Liechtenstein)
- Friedmann–Lemaître metric
- Frontal lobe
- Guilder
- Liechtenstein
- Ligature (writing)
- Volvo FL