SDEF
| Acronym | Definition |
|---|---|
| SDEF | Skin Disease Education Foundation |
| SDEF | Standard Data Exchange Format |
| SDEF | Scottish Disability Equality Forum (UK) |
| SDEF | San Dimas Experimental Forest (USDA; California) |
| SDEF | San Diego Environmental Foundation (California) |
| SDEF | Scottish Drug Enforcement Forum (UK) |