OCOS
| Acronym | Definition |
|---|---|
| OCOS | Old Coots on Scoots (motorbikes) |
| OCOS | Ordway Circle of Stars (Ordway Center for the Performing Arts; Saint Paul, MN) |
| OCOS | Orange County Orchid Society (California) |
| OCOS | Office Chief Of Signal |
| OCOS | Old Crusty Old Soldiers |
| OCOS | Organizational Change Orientation Scale |
| OCOS | Overseas Conditions of Service (Australia) |