BMB may mean:
- Blind man's buff - a popular children's game
- Brian Michael Bendis - American comic book writer
- Boston–Montreal–Boston - BMB is a randonnée bicycle event of approximately 1200 km
- Beattie McGuinness Bungay – a British advertising agency
- Bad Movie Beatdown - a web show about bad movies
- Baltic Marine Biologists - an international organisation to promote studies of the Baltic Sea area.
- Beast Mate Beast - a popular idiomatic expression local to New Zealand.
- Better Music Builder - a karaoke and audio equipment brand name developed in California, USA.
- Biochemistry and Molecular Biology-a department at the Johns Hopkins Bloomberg School of Public Health