| Acronym | Definition |
|---|
| ORPA➣Office of Research and Project Administration (various universities) |
| ORPA➣Oregon Recreation and Park Association |
| ORPA➣Orthophoto Analyst |
| ORPA➣Other Route with Public Access (UK) |
| ORPA➣Off Road Promoters Association (UK) |
| ORPA➣Organización Revolucionario del Pueblo en Armas (Spanish: Revolutionary Organization of the People in Arms; Guatemala) |
| ORPA➣Office of Research and Policy Analysis (Montana) |
| ORPA➣Ohio Rifle Pistol Association |