Leviathan may refer to the following:
- Leviathan (creature) - A massive aquatic organism that dwelled within Fundament, a disciple of the Traveler
- Leviathan (Titan) - Another massive aquatic organism, likely unrelated to the previous, found on Titan
- Leviathan (raid) - A raid that takes place on Emperor Calus's personal starship
- The Leviathan - A massive Cabal starship that eats planets, residence of the exiled Emperor Calus
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