| Acronym | Definition |
|---|
| OSSF➣Open Source Software Foundry (Institute of Information Science; Taipei, Taiwan) |
| OSSF➣On-Site Sewage Facility |
| OSSF➣Oakland Small Schools Foundation (Oakland, CA) |
| OSSF➣Open Society Support Foundation |
| OSSF➣On-Site Septic Facilities (Texas Natural Resource Conservation Commission) |
| OSSF➣Online Sport Stacking Federation (cup stacking) |
| OSSF➣Other Services Stock Fund |