| OBA | Oxygen Breathing Apparatus | 氧气呼吸器 |
| OBA | Open box audit | 開箱檢查 |
| OBA | Oklahoma Bar Association | 俄克拉荷马州律师协会 |
| OBA | Ontario Bison Association | 安大略野牛协会 |
| OBA | Ottawa Baptist Association (Canada) | 渥太华浸信会协会(加拿大) |
| OBA | Ontario Beekeepers' Association | 安大略的养蜂人协会 |
| OBA | One Bar Association | 一个律师协会 |
| OBA | Old Bostonian Association | 旧波士顿协会 |
| OBA | Oregon Bankers Association | 俄勒冈州银行家协会 |
| OBA | Oregon Business Association | 俄勒冈州商业协会 |
| OBA | Oklahoma Bandmaster's Association | 俄克拉何马州Bandmaster的协会 |
| OBA | Ontario Band Association | 安大略省乐队协会 |
| OBA | Outside Business Activities (NASD/FINRA) | 商业活动之外(全美证券交易商协会/ FINRA) |
| OBA | Ocala Bowling Association (Florida, USA) | 奥卡拉保龄球协会(美国佛罗里达州) |
| OBA | Oregon Bluegrass Association | 俄勒冈州蓝草协会 |
| OBA | Oklahoma Beekeepers Association | 俄克拉何马养蜂人协会 |
| OBA | Ontario Badminton Association (North York, ON, Canada) | 安大略省羽毛球协会(加拿大安大略省北约克) |
| OBA | Oklahoma Bondsman Association (Oklahoma City, OK) | 俄克拉荷马州债券人协会(俄克拉何马市,OK) |
| OBA | Ontario Basketball Association | 安大略省篮球协会 |
| OBA | Oklahoma Bankers Association | 俄克拉荷马州银行家协会 |
| OBA | Outdoor Basketball Association | 户外篮球协会 |
| OBA | Ontario Bar Association | 安大略省律师协会 |
| OBA | On Board Air (off road vehicle having compressed air source) | 车载空气(具有压缩空气源的越野车辆) |
| OBA | Operating Basis Accident | 运行基准事故 |
| OBA | Object Behavior Analysis | 对象行为分析 |
| OBA | Obadiah | 奥巴迪亚语 |
| OBA | Output-Based Aid | 基于输出的辅助 |
| OBA | Optical Brightening Agent | 光学增白剂 |
| OBA | Office of Biotechnology Activities (US National Institutes of Health) | 生物技术活动办公室(美国国立卫生研究院) |
| OBA | Outcomes Based Access | 基于结果的访问 |
| OBA | Office of Biotechnology Activity | 生物技术活动办公室 |
| OBA | Octave Band Analyzer | 倍频程分析仪 |
| OBA | Optical Bleaching Agent | 光学漂白剂 |
| OBA | On Base Average (or percentage; baseball statistic) | 基本平均数(或百分比;棒球统计数据) |
| OBA | Oberhasli Breeders of America | 美国Oberhasli育种家 |
| OBA | Optical Brightening Agent (chemicals which convert invisible UV light into visible blue light) | 光学增亮剂(将不可见紫外光转化为可见蓝光的化学品) |
| OBA | Oil Buying Alliance | 石油购买联盟 |
| OBA | Oban, Queensland, Australia | 澳大利亚昆士兰州奥本 |
| OBA | Office Business Application | Office业务应用程序 |
| OBA | Operating Budget Authority | 工作预算批准权限 |
| OBA | Optical Booster Amplifier | 光放大器 |
| OBA | Outside Bilateral Area | 双边区域外 |
| OBA | On-Board Allowance | 船上津贴 |
| OBA | Open Book Accounting | 开卷会计 |
| OBA | Operating Balancing Agreement (natural gas industry) | 运营平衡协议(天然气行业) |
| OBA | O'Brien & Associates | 'Brien和同伙。啊 |
| OBA | On Base Average | 基本平均值 |