| Acronym | Definition |
|---|
| BTB | Believed-to-Be (US DoD) |
| BTB | Badischer Turner Bund (German: Baden Gymnastics Federation; Baden, Germany) |
| BTB | Back to Bed |
| BTB | Back To Basics |
| BTB | Business to Business (usually seen as B2B) |
| BTB | Back-To-Back |
| BTB | Be the Beast |
| BTB | Branch Target Buffer |
| BTB | Bad Taste Bear(s) |
| BTB | Bob's Track Builder (gaming software) |
| BTB | Belize Tourism Board |
| BTB | Black to Black |
| BTB | Bass Treble Boost |
| BTB | Back to Back |
| BTB | Board Technical Bulletin |
| BTB | Break the Barriers |
| BTB | Base-to-Base (gaming) |
| BTB | Bob the Builder (cartoon) |
| BTB | Bog Te Blagoslovio (Croatian: God Bless You) |
| BTB | Body to Body |
| BTB | Bite the Bullet |
| BTB | Breakthrough Bleeding |
| BTB | Burn the Bridge |
| BTB | Bring to Boil (cooking) |
| BTB | By the Book |
| BTB | Big Team Battle (Halo 2) |
| BTB | Bumper to Bumper |
| BTB | Bride to Be |
| BTB | Ban the Bag (plastic bag ban advocacy) |
| BTB | Bringing Tap Back (Canada) |
| BTB | Banca di Trento E Bolzano (Italian bank) |
| BTB | Between the Buttons (Rolling Stones album) |
| BTB | Botswana Tourism Board (est. 2004) |
| BTB | Below the Belt |
| BTB | Beyond the Bell |
| BTB | Brigade Troops Battalion (US Army) |
| BTB | Beating the Blues (UK) |
| BTB | Board Technical Bulletin (scientology) |
| BTB | Bouchon de Tir à Blanc (French: Blank Firing Cap) |
| BTB | Back to Business |
| BTB | Back to Base |
| BTB | Bring That Booty |
| BTB | Book-To-Bill |
| BTB | Bric-a-Brac, Tramtrack, Broad-complex (domain) |
| BTB | Beyond the Beyond (game) |
| BTB | Bay to Breakers (annual footrace; San Francisco, CA) |
| BTB | Business Telephone Banking (various companies) |
| BTB | Boeuf de Tradition Bouchère (French: Traditional Beef Butcher) |
| BTB | Big Ten Burrito (Ann Arbor, MI) |
| BTB | Beyond the Breakers (offshore fishing) |
| BTB | Bus Tie Breaker |
| BTB | Banco Toyota do Brasil (Brazilian bank) |
| BTB | By The By |
| BTB | Bridge to Bridge (ship to ship communications) |
| BTB | Been There Bro |
| BTB | Basic Test Battery |
| BTB | Bromethymol Blue |
| BTB | Before the Bang (period just before the Big Bang) |
| BTB | British Tourism Board |
| BTB | Beyond the Body |
| BTB | Belgische Transportarbeiders Bond |
| BTB | Bad'in Town Bezak (French badminton club) |
| BTB | Benoît Tapis Brosse (French carpet supplier) |
| BTB | Better Than Beer |
| BTB | Burton Third Bombers (dorm residents; Massachusetts Institute of Technology; Cambridge, MA) |
| BTB | British Tourist Board |
| BTB | Body Tune Box (magnetic resonance imaging) |
| BTB | Blind Transmission Broadcast (clandestine communications) |
| BTB | Brett Taylor Bailey (foundation) |
| BTB | Big Town Bucks (online business) |
| BTB | Beyond the Barre (est. 1999; Canada; dance studio) |