SDF may refer to:
- Louisville International Airport (IATA airport code), an airport in Louisville, Kentucky, USA
- Seoul Digital Forum, an international digital technology conference held annually in Seoul, Korea
- Service delivery framework, a reference model for service providers
- Simplified Directional Facility, an aviation instrument approach navigational aid
- State Defense Forces, military units in the United States that operate under the sole authority of a state government
- Subwavelength-diameter optical fibre, an optical fibre with a diameter less than the photo-media wavelength
- SAME Deutz-Fahr, Italian-based agricultural machine manufacturer
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