| Acronym | Definition |
|---|
| OAB➣Ordem dos Advogados do Brasil (Brazil) |
| OAB➣Offline Address Book |
| OAB➣Oman Arab Bank |
| OAB➣Oracle Advanced Benefits |
| OAB➣Outlook Address Book |
| OAB➣One to All Broadcast |
| OAB➣Over-Active Bladder (urology) |
| OAB➣Outlook Address Book (Microsoft) |
| OAB➣Old Age Benefits |
| OAB➣Old Administration Building (various locations) |
| OAB➣Ofis Ar Brezhoneg (Breton: Breton Language Office; France) |
| OAB➣Oita Asahi Broadcasting (Japan) |
| OAB➣Ocean Affairs Board |
| OAB➣Osan Air Base (Pyong-Taek City, Kyong-Gi Province, ROK) |
| OAB➣Operations Approval Board (USAF) |
| OAB➣Operational Archives Branch (US Navy; Washington, DC) |