OPAG
| Acronym | Definition |
|---|---|
| OPAG | Outer Planets Assessment Group (NASA) |
| OPAG | Open Programme Area Group (WMO) |
| OPAG | Older Persons Action Group (senior citizens advocacy organization; Anchorage, AK) |
| OPAG | Ottawa Python Authors Group (programmers' group) |
| OPAG | Office of the Provincial Agriculture (Philippines) |
| OPAG | Oculus Photographic Arts Group (Venice, CA) |