DF
- China Railways DF
- China Railways DF4
- China Railways DF8
- Dairy
- Danish People's Party
- Daylight factor
- DeFRaG
- Decapacitation factor
- Defender (association football)
- Degrees of freedom
- Delta Force
- Democratic Front (Bosnia and Herzegovina)
- Democratic Front (Montenegro)
- Density function
- Design Factory
- Dielectric loss
- Direction finding
- Direction flag
- Dissipation factor
- Distrito Federal (Brazil)
- Distrito Federal (Mexico)
- Dongfeng (disambiguation)
- Dongfeng (missile)
- DragonFable
- Duty Free
- Dwarf Fortress
- Methylphosphonyl difluoride
- New Zealand DF class locomotive (1979)
- Quantum Air