The term class 9 could refer to:
- Class 9 gas giant, a type of planet
- Class 9 nebula, a type of nebula
- Class 9 neutronic wavefront, a type of neutronic wavefront
- Class 9 photon torpedo, a type of torpedo
- Class 9 pulsar, a type of pulsar
- Class 9 cargo vessel, a type of space vessel
- Class 9 warp drive, a type of warp drive
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