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 moon, a type of moon
* 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
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* , another series of classifications
Class 04