OPAN
| Acronym | Definition |
|---|---|
| OPAN | Oregon Public Affairs Network (Salem, OR) |
| OPAN | Opus Pro Animalibus et Natura (Lithuanian animal welfare organization) |
| OPAN | Older People and Ageing Research and Development Network (Wales, UK) |
| OPAN | Obesity, Physical Activity, and Nutrition (educational program; New Mexico) |
| OPAN | Ohio Patient Action Network (lobbyist group) |
| OPAN | On Pins and Needles |