COSF
| Acronym | Definition |
|---|---|
| COSF | Cgi Open Source Foundry |
| COSF | CGI (Common Gateway Interface) Open Source Federation |
| COSF | Child Outcomes Summary Form (various locations) |
| COSF | Conejo Open Space Foundation (est. 1995; Thousand Oaks, CA) |
| COSF | City of San Francisco (California) |
| COSF | Children of Sikkim Foundation (orphaned children fund) |
| COSF | Capital Outlay Stabilization Fund (Arizona) |