BBS is an abbreviation of:

• Bardet-Biedl syndrome
• Baton Broadcasting System
• "Be back soon" (Internet slang)
• Bhutan Broadcasting Service
• BIOS Boot Sequence
• Black Beauty Sisters, two of the characters of the anime Mermaid Melody Pichi Pichi Pitch (fan lingo).
• Blum Blum Shub random number generator
• Breeding Bird Survey
• Brittle Bone Society
• Brown Bull Shit
• Bulletin board system