Leviathan is a Biblical sea monster.

Leviathan may also refer to:

• Leviathan (Hobbes book), a 1651 book of political philosophy by Thomas Hobbes
• Leviathan (Auster novel), a 1992 novel by Paul Auster
• Leviathan (Westerfeld novel), a 2009 novel by Scott Westerfeld
• Leviathan, a 1975 novel in The Illuminatus! Trilogy by Robert Anton Wilson and Robert Shea
• Leviathan: The Unauthorised Biography of Sydney, a 1999 book by John Birmingham
• Leviathan, a 2007 book by Eric Jay Dolin about whaling
• Leviathan, or The Whale, a 2008 book by Philip Hoare
• Leviathan and Its Enemies, a 1995 manuscript by Samuel T. Francis published posthumously in 2016

• Leviathan (2000 AD), by Ian Edginton and D'Israeli
• Leviathan (comic strip), by Peter Blegvad
• Zettai Bōei Leviathan, a 2013 anime

• Leviathan (DC Comics), a terrorist organization the DC Universe against Batman and his allies
• Leviathan (Digimon)
• Leviathan (Farscape), a species of sapient spaceships in the Farscape television series
• Leviathan (Marvel Comics), a Soviet counterpart to HYDRA

• Leviathan (1989 film), a science fiction/horror film
• Leviathan (2012 film), a North American fishing industry film
• Leviathan (2014 film), a Russian film directed by Andrey Zvyagintsev
• The Leviathan (2015 concept teaser), written by Jim Uhls and directed by Ruairí Robinson
• "Leviathan" (Harsh Realm), an episode of the television series Harsh Realm
• "Leviathan" (Helstrom), an episode of Helstrom
• "Leviathan" (Legends of Tomorrow), an episode of the television series Legends of Tomorrow
• "The Leviathan" (Elementary), an episode of the television series Elementary
• Zettai Bōei Leviathan, a 2013 anime

• Leviathan: The Last Day of the Decade, a video game by Lostwood Games
• Mass Effect 3: Leviathan, a DLC pack for the video game Mass Effect 3
• Leviathan, the name of the first raid released in the video game Destiny 2
• Leviathan, a 1987 video game from English Software
• Leviathan class organisms, a type of lifeform in the 2018 video game Subnautica.

• Leviathan (musical project), a solo artist black metal band from San Francisco
• Leviathan, a late 1960s British rock band previously known as the Mike Stuart Span
• The New Leviathan Oriental Fox-Trot Orchestra, dance band from New Orleans

• Leviathan (Mastodon album), a 2004 album by American progressive/sludge metal band Mastodon
• Leviathan (Therion album), a 2021 album by Swedish symphonic metal band Therion

• "Leviathan" (Manic Street Preachers song)
• Leviathan (Esprit D'Air song), 2020

• Leviathan, the former stage name of WWE wrestler Dave Bautista

• 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

• Leviathan (1849), the first train ferry
• 5704 Leviathan, a British LMS Jubilee Class steam locomotive
• HMS Leviathan, several ships
• INS Leviathan, several ships
• SS Great Eastern, a 19th-century ocean liner, once called Leviathan
• SS Leviathan, a 20th-century ocean liner

• Leviathan (clothing), an Australian sportswear brand
• Leviathan (cross-stitch), a type of cross-stitch
• Leviathan (Canada's Wonderland), a roller coaster at Canada's Wonderland
• Leviathan (Gold Coast, Australia), a wooden roller coaster at Sea World in Australia
• Leviathan (horse), a racehorse
• Leviathan gas field, a natural gas field in the Mediterranean Sea near Israel
• Leviathan, a line of high-alcohol beers from Harpoon Brewery
• Leviathan Movement, a far-right Serbian organization