| OBA | O Breathing Apparatus 
| Others |
| OBA | O'Brien & Associates
| Others |
| OBA | O2 breathing apparatus
| Others |
| Oba | Obadiah
| Others |
| OBA | Oban, Queensland, Australia
| Others |
| OBA | Object Behavior Analysis
| Others |
| OBA | Office Business Application
| Others |
| OBA | Office Business Applications
| Others |
| OBA | Office of Biotechnology Activities
| Others |
| OBA | Office of Business Affairs
| Others |
| OBA | Ohio Bursars Association
| Others |
| OBA | Ohio Bus Association
| Others |
| OBA | Oil Buying Alliance
| Others |
| OBA | Oklahoma Bandmasters Association
| Others |
| OBA | Oklahoma Bankers Association
| Others |
| OBA | Oklahoma Bar Association
| Others |
| OBA | Oklahoma Bible Academy
| Others |
| OBA | Old Bostonian Association
| Others |
| OBA | Omaha Bar Association
| Others |
| OBA | On Base Average
| Others |
| OBA | On Board Air
| Others |
| OBA | On Board Analysis
| Others |
| OBA | On Board Audio
| Others |
| OBA | One Bar Association
| Others |
| OBA | One Bermuda Alliance
| Others |
| OBA | Online Behavioral Advertising
| Others |
| OBA | Online Business Account
| Others |
| OBA | Online Business App
| Others |
| OBA | Ontario Bar Association
| Others |
| OBA | Ontario Basketball Association
| Others |
| OBA | Ontario Beekeepers' Association
| Others |
| OBA | Open Business Accounting
| Others |
| OBA | Openbare Bibliotheek Amsterdam
| Others |
| OBA | Opened Bible Academy
| Others |
| OBA | Operations Bridge Analytics
| Others |
| OBA | Optical Booster Amplifier
| Others |
| OBA | Optical Brightening Agent
| Others |
| OBA | Optical Brightening Agents
| Others |
| OBA | Optimized Hydraulic Brakes
| Others |
| OBA | Oracle Business Analytics
| Others |
| OBA | Oregon Bankers Association
| Others |
| OBA | Oregon Biomedical Association
| Others |
| OBA | Oregon Bioscience Association
| Others |
| OBA | Oregon Business Association
| Others |
| OBA | Organized Brazilian Activities
| Others |
| OBA | Orinda Baseball Association
| Others |
| OBA | Our Barrel Ale
| Others |
| OBA | Our Better Angels
| Others |
| OBA | Out of Box Audit
| Others |
| OBA | Outdoor Basketball Association
| Others |
| OBA | Outlook Backup Assistant
| Others |
| OBA | Output-based aid
| Others |
| OBA | Outside Business Activities
| Others |
| OBA | Outsourcing Bookkeeping Accounting
| Others |
| OBA | Outstanding Black Achievers
| Others |
| OBA | Outward Bound Adventures
| Others |
| OBA | Outward Bound Angeles
| Others |
| OBA | Oxford Broadcasting Association
| Others |
| OBA | Oxygen Breathing Apparatus
| Others |