| 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) |