D
- D-Motor
- D. W. Onan — U.S.
- Deschamps
- Daimler-Benz
- Darraq
- de Havilland — UK
- de Laval
- Deicke
- Delafontaine
- DeltaHawk - U.S.
- Aeromotor
- Doble-Besler
- Dobrynin
- Dongan Engine Manufacturing Company - China
- Douglas
- Douglas — UK
- Dreher
- Duesenburg
- Duthiel-Chambers
- Dux
- Dyna-Cam
Read more about this topic: List Of Aircraft Engine Manufacturers