Leviathan could refer to several things:
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- , a type of submersible carrier.
- Leviathan, a planet.
- Leviathan, Darth Malak's Interdictor-class cruisercommand ship.
- Leviathan, a Dreadnaught-class heavy cruiser.
- Leviathan, a luxury liner.
- Leviathan, bio-engineered monsters created by Dark Jedi during the Hundred-Year Darkness.
- , a predecessor to the World Devastator.
- , an oceanic mammal from Dorumaa.
- Leviathan, a giant squid from Arrakan.
- , a type of body armor produced by the Mon Calamari.