| Acronym | Meaning |
| BTB | Believed-to-Be (US DoD) |
| BTB | Blind Transmission Broadcast (clandestine communications) |
| BTB | Botswana Tourism Board (est. 2004) |
| BTB | Bouchon de Tir à Blanc (French: Blank Firing Cap) |
| BTB | Bridge to Bridge (ship to ship communications) |
| BTB | Brigade Troops Battalion (US Army) |