| OSSP | Office of Safety Security and Protection 
| Others |
| OSSP | Office of Scholarship and Sponsored Projects
| Others |
| OSSP | Office of Special Scholarship Programs
| Others |
| OSSP | Office of Sponsored Scholarship and Programs
| Others |
| OSSP | Office of Strategic Sourcing and Procurement
| Others |
| OSSP | Office of Student Service and Placement
| Others |
| OSSP | Omni Spectra subminiature push
| Others |
| OSSP | Ongoing Support Services Plan
| Others |
| OSSP | Open Shop Scheduling Problem
| Others |
| OSSP | Open Source Science Project
| Others |
| OSSP | Open Source Security Project
| Others |
| OSSP | Open Source Software Project
| Others |
| OSSP | Open Space Stewardship Program
| Others |
| OSSP | Operating System Service Provider
| Others |
| OSSP | Oregon State Student Pharmacists
| Others |
| OSSP | Organization Standard Software Process
| Others |
| OSSP | Organizational Safeguards and Security Plan
| Others |
| OSSP | Otolaryngology Surgeon Scientist Program
| Others |
| OSSP | Outsourced Services and Support Provider
| Others |