| Abbreviation | Definition |
|---|---|
| SEWA | Self Employed Women's Association |
| SF | Sunshine Foundation |
| SFA | Stuttering Foundation of America |
| SFAC | Substitute Families For Abandoned Children |
| SFAS | San Francisco Aquarium Society |
| SFAS | Scottish Foundation Allocation Scheme |
| SFAS | Swiss Foot and Ankle Society |
| SFBI | San Francisco Beacon Initiative |
| SFC | Stand For Children |
| SFCD | Shop For Charity Day |
| SFCF | Sladechild Foundation Charitable Foundation |
| SFCG | Search For Common Ground |
| SFD | Social Fund for Development |
| SFDC | Springfield Finance and Development Corporation |
| SFE | Society of Free Expression |
| SFF | Semper Fi Fund |
| SFF | Space Frontier Foundation |
| SFFS | St. Francis Family Services |
| SFHIIN | Syed Farooq Hussaini Islamic Interfaith Network |
| SFI | Scleroderma Foundation, Inc. |