| Abbreviation | Definition |
|---|---|
| SDCF | Stage Directors and Choreographers Foundation |
| SDDC | Sporting Dog Defense Coalition |
| SDDF | Skin and Dental Dysfunction Foundation |
| SDF | Social Development Foundation |
| SDFA | Service Dogs For America |
| SDFC | San Diego Fellow Calligraphers |
| SDFCCLA | South Dakota Family, Career, and Community Leaders of America |
| SDFF | San Diego Futures Foundation |
| SDFF | Sustainable Development Facility Fund |
| SDFN | Shack Dwellers Federation of Namibia |
| SDFW | Social Development Funding Window |
| SDLA | San Diego Leadership Alliance |
| SDMF | San Diego Music Foundation |
| SDMS | Society of Diagnostic Medical Sonography |
| SDMUG | San Diego Macintosh User Group (California) |
| SDN | Student Doctor Network |
| SDO | Sanayee Development Organization |
| SDRF | Software Defined Radio Forum, Inc. |
| SDSF | Shwachman-Diamond Syndrome Foundation |
| SDSI | Shwachman-Diamond Syndrome International |