| Acronym | Definition |
|---|
| BRO | Brother |
| BRO | Browning (Amtrak station code; Browning, MT) |
| BRO | Big Red One (First Infantry Division; US Army) |
| BRO | Basic Rights Oregon |
| BRO | Breault Research Organization |
| BRO | Brabham Racing Organisation (UK) |
| BRO | Blackwell Reference Online (academic library) |
| BRO | Border Roads Organisation (India) |
| BRO | Bromine Monoxide |
| BRO | Better Regulation Office (Australia) |
| BRO | Base Repair Organisation (now Naval Dockyard; Visakhapatnam, India) |
| BRO | Budget Review Officer (US DoD) |
| BRO | Banque Régionale de l'Ouest (French: Regional Bank of the West) |
| BRO | Best Reasonable Offer (classified ads) |
| BRO | By Recommendation Only (wedding planner) |
| BRO | BMX Riders Organization |
| BRO | Bikers Rights Organization |
| BRO | Baltics, Russia, and Other countries of the former Soviet Union |
| BRO | Brno, Turany Czech Republic (airport code) |
| BRO | Bridge Replacement Off System |
| BRO | Baton Rouge Observatory |
| BRO | Business Representative Organisation |
| BRO | Budget Responsible Officer |
| BRO | Brevet de Randonneur de l'Oisans (French cycling event) |
| BRO | Brownsville, TX, USA - South Padre Island International (Airport Code) |