BSD can refer to any of the following acronyms:

• Berkeley Software Distribution, a free Unix-like operating system, and numerous variants. See Comparison of BSD operating systems.
• the BSD license, a permissive license, one of the most widely used free software licenses.
• Birsa Seva Dal, a political group in India.
• Bahamian dollar, ISO 4217
• Blue Screen of Death, a computer jargon phrase related to Microsoft Windows.
• Black Spiral Dancers, a Tribe of evil-aligned werewolves in the White Wolf produced role-playing game The Apocalypse.
• Bermuda Shorts Day, a party at University of Calgary to celebrate end of classes.
• Bellevue School District, the school district of Bellevue, WA.
• Big Swinging Dick, term of praise for a particularly brash financier popularized by Michael Lewis's Liar's Poker.

BSD | BSD