| OPSS | Observatory for Planets and Stars in Space 
| Others |
| OPSS | Occupational Pension Schemes Survey
| Others |
| OPSS | Office for Product Safety and Standards
| Others |
| OPSS | Office of Project Support Services
| Others |
| OPSS | Office of Public Safety and Security
| Others |
| OPSS | Office of Public Service and Science
| Others |
| OPSS | Online Patient Self Scheduling
| Others |
| OPSS | Ontario Provincial Standard Specification
| Others |
| OPSS | OPerations Safety System
| Others |
| OPSS | OPerations Sales and Service Council (Credit Union National Association)
| Others |
| OPSS | OPerations, Sales, and Service
| Others |
| OPSS | Optics and Photonics Society of Singapore
| Others |
| OPSS | Oracle Platform Security Services
| Others |
| OPSS | Orange Programmable Sensor System
| Others |
| OPSS | Orbital Propellant Storage Subsystem
| Others |
| OPSS | Orchard Park Secondary School
| Others |
| OPSS | ORCHESTRA Process Support System
| Others |
| OPSS | Orchid Park Secondary School
| Others |
| OPSS | Orlando Pool and Spa Show
| Others |
| OPSS | Other Products Self Service
| Others |
| OPSS | Ouachita Parish School System
| Others |
| OPSS | Outlet Plastering Safety Shield (plastering guide tool)
| Others |
| OPSS | Outside Parts Sales and Service
| Others |
| OPSS | Overlay P2P Streaming Simulator
| Others |
| OPSS | Overwhelming Post Splenectomy Sepsis
| Others |
| OPSS | Saidu Sharif, Pakistan
| Others |