| Acronym | Definition |
|---|
| OBA | Oklahoma Bar Association |
| OBA | Office Business Application (Microsoft) |
| OBA | On Board Air (off road vehicle having compressed air source) |
| OBA | Obadiah |
| OBA | Office of Biotechnology Activities (US National Institutes of Health) |
| OBA | On Base Average (or percentage; baseball statistic) |
| OBA | Online Behavioral Advertising (Internet marketing; various companies) |
| OBA | Output-Based Aid |
| OBA | Oxygen Breathing Apparatus |
| OBA | Optical Brightening Agent |
| OBA | Ontario Badminton Association (North York, ON, Canada) |
| OBA | Ontario Basketball Association |
| OBA | Object Behavior Analysis |
| OBA | Ontario Beekeepers' Association |
| OBA | Outside Business Activities (NASD/FINRA) |
| OBA | Oregon Bluegrass Association |
| OBA | Open Book Accounting |
| OBA | Ontario Band Association |
| OBA | Outcomes Based Access |
| OBA | Operation Bootstrap Africa (Minnesota) |
| OBA | Optical Booster Amplifier |
| OBA | Octave Band Analyzer |
| OBA | Office of Biotechnology Activity |
| OBA | Open Box Audit |
| OBA | Oberhasli Breeders of America |
| OBA | Oklahoma Bandmaster's Association |
| OBA | Operating Basis Accident |
| OBA | Operating Budget Authority |
| OBA | Optical Bleaching Agent |
| OBA | Operating Balancing Agreement (natural gas industry) |
| OBA | On-Board Allowance |
| OBA | Outward Bound Adventures, Inc. (Pasadena, CA) |
| OBA | Oklahoma Bondsman Association (Oklahoma City, OK) |
| OBA | Oklahoma Beekeepers Association |
| OBA | Ottawa Baptist Association (Canada) |
| OBA | Outside Bilateral Area |
| OBA | Ontario Bison Association |
| OBA | Ocala Bowling Association (Florida, USA) |
| OBA | Open Book Assessment (academics) |
| OBA | Outsourced Benefits Administration (software; Workscape) |
| OBA | Overseas Buffaloes Association (various locations) |
| OBA | Openbare Bibliotheek Amsterdam (Dutch: Amsterdam Public Library; Amsterdam, Netherlands) |
| OBA | Organization of Black Alumni (Wayne State University; Detroit, MI) |
| OBA | Oxford Business Alumni (UK) |