| Acronym | Definition |
|---|
| BRB | Be Right Back (chat/slang) |
| BRB | Barbados (ISO Country code) |
| BRB | Brandenburg |
| BRB | Birmingham Royal Ballet |
| BRB | Benefits Review Board (US Department of Labor) |
| BRB | Brienz Rothorn Bahn (Swiss railway) |
| BRB | British Railways Board |
| BRB | Bond Review Board (Texas) |
| BRB | Banque de la République du Burundi (Central Bank of Burundi) |
| BRB | Bar Room Bar (UK) |
| BRB | Bathroom Break (chat) |
| BRB | Big Red Button |
| BRB | Benelux Research Business |
| BRB | Biometric Research Branch |
| BRB | Brigade de Répression du Banditisme (French police) |
| BRB | Builders Registration Board (AU) |
| BRB | Buckling-Restrained Brace (engineering) |
| BRB | Brazilian Rainbow Boa (herpetoculture) |
| BRB | Butler Rogers Baskett Architects |
| BRB | Bright Red Blood (medical) |
| BRB | Bath Room Break |
| BRB | Blue Ridge Broadcasting |
| BRB | Business Research Bureau |
| BRB | Blue Ridge Boogie |
| BRB | Black River Boats |
| BRB | Baseline Review Board (US Navy) |
| BRB | Budget Review Board |
| BRB | Briggs Rainbow Buildings, Inc. |
| BRB | Biweekly Rate Booklet |
| BRB | Base Rate Boundary |
| BRB | Bug Review Board |
| BRB | Brittany Rolled Baits |
| BRB | Business Reducing Barriers (UK) |
| BRB | Big Red Band |
| BRB | Bernard and Audre Rapoport Building (University of Texas, Austin) |
| BRB | Bayerische Regionalbahn (German: Bavarian Regional Rail; Bavaria, Germany) |
| BRB | Bongibault Rénovation Bâtiment (French building renovation company) |
| BRB | Black Raid Bulls (French airsoft club) |
| BRB | Batteries de Renseignement de Brigade (French armed forces unit) |
| BRB | Banco Regional de Brasília SA (Brazilian bank) |
| BRB | Buried Ruins of Bacaba (gaming, Outwar Zone) |
| BRB | Baguio Realtors Board (Philippines) |