Dibb - Disp
- Dibb cock
- Dielectric
- Diesel cycle
- Diesel electric drive
- Diesel engine
- Diesel index
- Diesel knock
- Diesel-engined vehicle
- Differential (differential unit)
- Differential angle
- Differential case
- Differential gear
- Differential shaft
- Dilution air
- Dilution factor
- Dilution ratio
- Dimension
- Dimmer switch
- Dip stick
