- Degradation
- Degree of Polymerization
- Design Stress
- Diamagnetism
- Die
- Dielectric
- Dielectric constant
- Dielectric Strength
- Diffusion
- Diffusion Coefficient
- Diode
- Dipole
- Dislocation
- Dislocation Density
- Dislocation Line
- Dispersion Strengthening
- Domain (Magnetic)
- Donor level
- Doping
- Ductile Fracture
- Ductile Iron
- Ductile to Brittle Transition
- Ductility