| Acronym | Definition |
|---|
| OARS | Outdoor Adventure River Specialists (guide service) |
| OARS | Open-Ended Questions, Affirmations, Reflective Listening, Summaries (psychiatry) |
| OARS | Orientation, Advising and Registration Session (North Idaho College) |
| OARS | Open Access Repository System (University of Oxford; UK) |
| OARS | Outlying Area Reporting Station (US DHS) |
| OARS | Ontario Association of Remote Sensing |
| OARS | Open Architectural Retrieval System (Navy) |
| OARS | Obligation Adjustment Reporting System (USAF) |
| OARS | Online Access Request System |
| OARS | Olympic Athletes Rowing at Saugatuck |
| OARS | Ocean Area Reconnaissance Satellite |
| OARS | Older Americans Resources Study |