OPSA
| Acronym | Definition |
|---|---|
| OPSA | Office of Professional School Advising (Texas A&M University) |
| OPSA | Oklahoma Political Science Association |
| OPSA | Oxidation Phenomena in Severe Accidents (project; EU) |
| OPSA | Odontologia Personalizada SA (Portuguese: Personalized Dentistry) |
| OPSA | OSSTMM (Open Source Security Testing Methodology Manual) Professional Security Analyst (certification; Institute for Security and Open Methodologies) |
| OPSA | Oregon Public Safety Academy |
| OPSA | Organismes Paritaires Collecteurs Agrées |