OPSO
| Acronym | Definition |
|---|---|
| OPSO | Ouachita Parish Sheriff Office (Monroe, LA) |
| OPSO | Operations Officer |
| OPSO | Older People Speak Out (Australia) |
| OPSO | On Public Service Only (postage; New Zealand) |
| OPSO | Osteopathic Physicians and Surgeons of Oregon (Portland) |
| OPSO | Over Pressure Shut-Off (valve) |
| OPSO | Open Software (Italian software and web services company) |
| OPSO | Office of Pipeline Safety Operations (US DOT) |
| OPSO | Overlapping Pairs Sparse Occupancy Test (random number generators) |