| Acronym | Definition |
|---|
| RAB | Rapid Action Battalion (Bangladesh) |
| RAB | Rabobank (Tour de France cycling sponsor) |
| RAB | Regulatory Asset Base |
| RAB | Reichsautobahn (German: Highway of the Reich) |
| RAB | Radio Advertising Bureau |
| RAB | Rhythm and Blues |
| RAB | Radio Receiver (high frequency; US Navy) |
| RAB | Range and Bearing |
| RAB | Restoration Advisory Board |
| RAB | Rotary Air Blast (mining) |
| RAB | Registrar Accreditation Board (ANSI) |
| RAB | Ready Alert Brakes |
| RAB | Radio Access Bearers |
| RAB | Resource Accounting and Budgeting |
| RAB | Regionalverkehr Alb-Bodensee GmbH (German) |
| RAB | RAID Advisory Board |
| RAB | Rabaul, Papua New Guinea - Lakunai (Airport Code) |
| RAB | Resistivity-at-the-Bit (measuring tool) |
| RAB | Royal Academy of Ballet |
| RAB | Regional Activities Board (IEEE) |
| RAB | Radio Access Bearer |
| RAB | Regulus A. Black (Harry Potter 6) |
| RAB | Residential Advisory Board (various schools) |
| RAB | Radio Aomori Broadcasting (Japan) |
| RAB | Red, Amber and Black (Bradford Bulls Rugby League fans forum) |
| RAB | Retail Advisory Board (various organizations) |
| RAB | Remote Afterloading Brachytherapy |
| RAB | Retarded Animal Babies |
| RAB | Renewal At Birth |
| RAB | Rest Assured Bodyworks (Canada) |
| RAB | Report Acceptance Body (accounting) |
| RAB | Postal Tax Semipostal (Scott Catalogue prefix; philately) |
| RAB | Regulatory Affairs Branch (National Cancer Institute) |
| RAB | Regional Accountability Bureau (Pakistan) |
| RAB | Recycling Advisory Board (various locations) |
| RAB | Random Access Burst |
| RAB | Rembo Auto-Backup |
| RAB | Restricted Area Badge |
| RAB | Rectangular Array Beamformer |
| RAB | Resident Authority Board |
| RAB | Risk Assessment Board (various organizations) |
| RAB | Réseau Africain de Biosciences (French: African Biosciences Network) |
| RAB | Risk Assurance Board (Elexon Ltd.; UK) |