OPAA
| Acronym | Definition |
|---|---|
| OPAA | Ohio Prosecuting Attorneys Association |
| OPAA | Office of Post Award Administration (Oregon State University and University of Texas) |
| OPAA | Organization for the Prevention of AIDS in Africa (est. 2001) |
| OPAA | Outstanding PolyU (Polytechnic University) Alumni Award (Hong Kong) |
| OPAA | Other Public Access Areas (water management) |
| OPAA | Oregon Political Accountability Act |