- 8813 Leviathan, a main belt asteroid
- Leviathan (cipher), a stream cipher
- Leviathan, junior synonym of the genus Mammut, or mastodons
- Leviathan gas field in the Eastern Mediterranean
- Leviathan of Parsonstown, a telescope in Birr, Ireland
- Leviathan Patera, a depression on Neptune's moon Triton
- Livyatan melvillei (formerly Leviathan melvillei), a species of extinct whale
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