Class D
The term Class D may refer to:
- Class D, a planet classification from the fictional Star Trek universe
- Class D, a modern stellar classification
- Class D (baseball), a defunct class in minor league baseball in North America
- Class-D amplifier or switching amplifier
- Class D IP addresses on a Classful network
- Class D Airspace class as defined by the ICAO
- Class D league, a classification of minor league baseball from 1902 to 1962
- Class D, a type of Driver's license in the United States
- Class D, on list of North American broadcast station classes
- Class D, also d-segment, car class of large family cars which are larger than a small family car (C-Segment) and smaller than an executive car (E-Segment)
- Class D fire extinguisher