Class D

The term Class D may refer to:


 * Class D (baseball), a defunct class in minor league baseball in North America
 * Class-D amplifier or switching amplifier
 * Class D fire extinguisher
 * Class D league, a classification of minor league baseball from 1902 to 1962
 * Class D star, a stellar classification
 * Class D, IP addresses on a classful network
 * Class D, an airspace class as defined by the ICAO
 * Class D, a type of Driver's license in the United States
 * Class D, a North American broadcast station class
 * Class-D, a type of character in the video game SCP – Containment Breach