Class 4

The term class 4 could refer to:


 * Class 4 black hole, a type of black hole
 * Class 4 cloaking device, a type of cloaking device
 * Class 4 industrial replicator, a type of industrial replicator
 * Class 4 microprobe, a type of probe
 * Class 4 probe, a type of probe
 * Class 4 pulsar, a type of pulsar
 * Class 4 stardrive vessel, a starship class designation
 * Class 4 tactical vessel, a type of Borg starship