| OAB | Obleo A Beck 
| Others |
| OAB | Ocean Affairs Board
| Others |
| OAB | Office of Architecture in Barcelona
| Others |
| OAB | Official At Bat
| Others |
| OAB | Offline Address Book
| Others |
| OAB | Offline Address Books
| Others |
| OAB | OGC Architecture Board
| Others |
| OAB | Ohio Association of Broadcasters
| Others |
| OAB | Oklahoma Accountancy Board
| Others |
| OAB | Oklahoma Association of Broadcasters
| Others |
| OAB | Older Adult Beginner
| Others |
| OAB | Oman Arab Bank
| Others |
| OAB | On Anhydrous Basis
| Others |
| OAB | One Angry Boy
| Others |
| OAB | One Arm Bandit
| Others |
| OAB | One to All Broadcast
| Others |
| OAB | Online Address Book
| Others |
| OAB | Ontario Association of Broadcasters
| Others |
| OAB | Oracle Advanced Benefits
| Others |
| OAB | Ordem dos Advogados do Brasil
| Others |
| OAB | Ordem dos Advogados do Brasil (Brazilian Law Board)
| Others |
| OAB | Order of Attorneys of Brazil
| Others |
| OAB | Oregon Association of Broadcasters
| Others |
| OAB | Osan Air Base
| Others |
| OAB | Oskolochnaya Aviatsionnaya Bomba
| Others |
| OAB | Ostomy Association of Boston
| Others |
| OAB | Ottawa Auto Brokers
| Others |
| OAB | Outlook Address Book
| Others |
| OAB | Over Active Bladder
| Others |
| OAB | Over- Active Bladder
| Others |
| OAB | Overactive bladder
| Others |
| OAB | Overall Bounds
| Others |
| OAB | Overt Antisocial Behavior
| Others |