OPIR
| Acronym | Definition |
|---|---|
| OPIR | Overhead Persistent Infrared |
| OPIR | Office of Planning and Institutional Research (various universities) |
| OPIR | Office of Program and Integrity Reviews (Social Security) |
| OPIR | Organization for the Promotion of International Relations (Japan) |
| OPIR | Office of Pharmaceutical Industry Research (Japan; est. 1999) |