| Acronym | Definition |
|---|
| OPAS | Opera and Performing Arts Society (Texas A&M University) |
| OPAS | Overpass (street type) |
| OPAS | Office of the Pensions Advisory Service (UK) |
| OPAS | Ontario Plein Air Society (Canada) |
| OPAS | Oconee Performing Arts Society (Greensboro, GA) |
| OPAS | Operations Planning and Analysis Systems |
| OPAS | Outpatient Pharmacy Anticoagulation Service |
| OPAS | Officer Performance Appraisal System |
| OPAS | Overhead Panel Arinc System |
| OPAS | Overseas Personal Address Service (est. 1990) |
| OPAS | Outside Plant Area Supervisor (telecommunications; telephony) |
| OPAS | Organizational Performance Assessment System (agricultural research) |
| OPAS | On Press Application System (Mead Corporation) |
| OPAS | Orchestra Planning Administration System |