Leviathan could refer to:
- Starships and vehicles:
- USS Leviathan (Sovereign-class), a Starfleet Sovereign-class cruiser in service in the 2370s
- USS Leviathan (NCC-73966), a Starfleet Regent-class cruiser in service in the early 25th century
- IKS Leviathan, a Klingon Defense Force starship in service in the 23rd century
- Leviathan-class
- Leviathan
- "Leviathan (comic)", a Voyager comic
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