BFL can stand for:
- Bayesian Filtering Library
- Big Fat Liar, 2002 comedy film starring Frankie Muniz from TV's Malcolm in the Middle, Nickelodeon's Amanda Bynes, and Paul Giamatti
- Bluefaced Leicester
- Body for Life, a fitness program created by Bill Phillips
- Bat for Lashes, the stage name of English musician Natasha Khan.