| 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 |
