| Rank | Abbreviation | Meaning |
|---|
| ***** | OSSC | Ontario Secondary School Certificate
| |
| **** | OSSC | Open Source Software Center
| |
| *** | OSSC | Oregon School Study Council (University of Oregon; Eugene, OR)
| |
| ** | OSSC | Open Source Software Collection
| |
| ** | OSSC | Open Source Software Competition
| |
| * | OSSC | Orchid Society of Southern California (Burbank, CA)
| |
| * | OSSC | Offshore Safety and Survival Centre (St Johns, Newfoundland and Labrador, Canada)
| |
| * | OSSC | Old Saybrook Soccer Club (Old Saybrook, CT)
| |
| * | OSSC | Office of the State Service Commissioner
| |
| * | OSSC | Oregon Structural Specialty Code
| |
| * | OSSC | Original Softshell Case (guitar)
| |
| * | OSSC | Operational System Support Center
| |
| * | OSSC | On Site Service Call
| |
| * | OSSC | One Stop Service Center
| |
| * | OSSC | Oil Spill Service Centre (UK)
| |
| * | OSSC | Operations Support Services Contract
| |
| * | OSSC | Open Systems Steering Committee
| |
| * | OSSC | Open Source System Code
| |
| * | OSSC | Old Style Siamese Club
| |
| * | OSSC | Orissa State Seeds Corporation (India)
| |
| * | OSSC | Officer Students Spouses Club
| |
| * | OSSC | Officer Student Spouse's Club (US Navy)
| |
| * | OSSC | Operatore Socio Sanitario con formazione Complementare
| |
| * | OSSC | One Stop Submission Centre
| |
| * | OSSC | On Scene Surveillance Coordinator
| |