| OARS | Ontario Association of Remote Sensing | 安大略省遥感协会 |
| OARS | Ocean Area Reconnaissance Satellite | 海洋区域侦察卫星 |
| OARS | Older Americans Resources Study | 老年美国人资源研究 |
| OARS | Obligation Adjustment Reporting System (USAF) | 义务调整报告系统（USAF） |
| OARS | Online Access Request System | 在线访问请求系统 |
| OARS | Outdoor Adventure River Specialists (guide service) | 户外探险河流专家（导游服务） |
| OARS | Olympic Athletes Rowing at Saugatuck | 奥运会运动员在索加图克划船 |
| OARS | Open Architectural Retrieval System (Navy) | 开放式体系结构检索系统（海军） |
| OARS | Outlying Area Reporting Station (US DHS) | 边远地区报告站（美国国土安全局） |
| OARS | Opening Automated Report Service | 打开自动报告服务 |
| OARS | Onsite Agent's Reference Set | 现场代理参考 |