BF (or similar) may refer to:
BF (protein), an initialism for B factor, a triggering protein of the alternative pathway of complement activation
Black Friday,
Baitul Futuh, a mosque in London
Battlefront, a contested armed frontier between opposing forces
Boyfriend, a term for a male partner
Best friend, in internet slang, see friendship
Beaver Falls, Pennsylvania, a city in western Pennsylvania
Bonners Ferry, Idaho, a town in Idaho, United States
Bongo Frontier, a pickup truck built by Kia Motors
Brainfuck, a programming language
Battlefield, a game
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