OSSF
| 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 |