| OPSS | Occupational Pension Schemes Survey | |
| OPSS | Other Products Self Service | |
| OPSS | Ouachita Parish School System | |
| OPSS | Orchard Park Secondary School | |
| OPSS | Office of Public Service and Science | |
| OPSS | Orange Programmable Sensor System | |
| OPSS | ORCHESTRA Process Support System | |
| OPSS | OPerations Safety System | |
| OPSS | Oracle Platform Security Services | |
| OPSS | Overwhelming Post Splenectomy Sepsis | |
| OPSS | Outside Parts Sales and Service | |
| OPSS | Office of Project Support Services | |
| OPSS | Online Patient Self Scheduling | |
| OPSS | Office for Product Safety and Standards | |
| OPSS | Overlay P2P Streaming Simulator | |
| OPSS | Office of Public Safety and Security | |
| OPSS | Office of Public Safety Support | |
| OPSS | Office for Product Safety Standards | |
| OPSS | Operations and Programmatic Support Services | |
| OPSS | Ontario Provincial Standards and Specifications | |
| OPSS | OPerations Sales and Service Council (Credit Union National Association) | |
| OPST | OSSTMM (Open Source Security Testing Methodology Manual) Professional Security Tester | |
| OPST | Osstmm Professional Security Tester | |
| OPST | O P T Sciences Corporation | |
| OPST | Optical Packet Switch and Transport |
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