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

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