Legion
Legion may refer to:

Military
Roman legion, the basic military unit of the ancient Roman army
Aviazione Legionaria, Italian air force during the Spanish civil war
A legion is the regional unit of the Italian carabinieri
Spanish Legion, an elite military unit within the Spanish Army
Condor Legion, a unit of military personnel from the air force and army of Nazi Germany
French Foreign Legion, a part of the French Army, created for foreign nationals willing to serve in the French Armed Forces
International Legion of Territorial Defense of Ukraine, a Ukrainian foreign volunteer wing of the 2022 Russo-Ukrainian war
HMS Legion (1914), a Royal Navy World War I destroyer
HMS Legion (G74), a Royal Navy World War II destroyer sunk in 1942
Legion of the United States, a reorganization of the United States Army from 1792 to 1796
Various military legions, often composed of soldiers from a specific ethnic, national, religious or ideological background

Veterans' organizations
American Legion, an organization of American veterans
The Royal British Legion, a UK charity providing support for members of the British Armed Forces and their dependents
Royal Canadian Legion, a non-profit Canadian veterans' organization
South African Legion of Military Veterans, the oldest veterans organization organisation in South Africa
Society of the Cavaliers of the Order of Lāčplēsis & Freedom Fighters, also known as the Legion, a right-wing veterans' organisation founded by Voldemārs Ozols (1884–1949)

Arts and media
Comics
Legion (Marvel Comics), a Marvel Comics antihero
Legion (DC Comics), a DC Comics supervillain
Legion of Super-Heroes, a DC Comics superhero team
The Legion (comics), one of the comic books where the Legion of Super-Heroes was published
Legion, a group of characters from the Spawn series
Legion (IDW Publishing), a comic book based on the 2010 film of the same name
Legion, a member of the Special Executive
L.E.G.I.O.N., a 1989 DC Comics title and a team of superheroes, the 20th Century forerunners to the Legion of Superheroes
Ghostbusters: Legion, a 2004 comic book series

Film and television
"Legion" (Law & Order: Criminal Intent), the eighteenth episode in the second season of Law & Order: Criminal Intent
"Legion" (Red Dwarf), the second episode of Red Dwarf Series VI
Legion (1998 film) a 1998 made-for-television film
Legion (2010 film) a 2010 apocalyptic supernatural action film
The Legion (film) a 2020 film starring Mickey Rourke
Legions (film), a 2022 Argentine supernatural horror film
Legion (TV series), an FX TV series based on the Marvel Comics character
"Legion", an eighth-season episode of the television series Smallville
Legion, an alien kaiju seen in the film Gamera 2: Attack of Legion
Legion, a fictional computer network in the 2019 film Terminator: Dark Fate

Games
Legion, a often appearing enemy in the Castlevania series.
Legion Gold, or simply Legion, a strategy game
Legions (Magic: The Gathering), a set of cards in the game Magic: The Gathering
Legion (Mass Effect), the adopted name of a synthetic intelligence in Mass Effect 2
Legion, central villain of the video game Shadow Man
Legion, an artificial intelligence unit in Command & Conquer 3: Kane's Wrath
World of Warcraft: Legion, the sixth World of Warcraft expansion set
The Legion, a group of killer characters in the horror video game Dead by Daylight
Watch Dogs: Legion, an action-adventure game and the third installment in the Watch Dogs series

Plays
Legion, a play by Hal Corley

In print
Legion (novella series), a series of novellas by Brandon Sanderson
Legion, a unit in the army of the fictional The Domination
Legion (Blatty novel), a 1983 novel by William Peter Blatty
Legion (demon), a group of demons referred to in the Christian Bible
Legion, by Dan Abnett, book 7 in the Horus Heresy book series
The Legion (novel), a 2010 historical novel by Simon Scarrow

Music
Legion Records, started in 1997 by Michael Brosnan under the name Goatboy Records
Legion (band) a deathcore band from Columbus, Ohio
Legion, stage name of Erik Hagstedt, Swedish vocalist in the black metal band Marduk
The Legion, a hip hop group from the Bronx, New York, associated with Black Sheep
Legion (album), a 1992 album by Deicide
Legion, a 1985 album by Mark Shreeve
Legions, a 2013 album by the Danish band Artillery
"Legion", a song by Candiria from the album Kiss the Lie
"Legion", a song by HammerFall from the album No Sacrifice, No Victory
"Legion", a song by Junkie XL from the album Big Sounds of the Drags
"Legion", a song by Saviour Machine from the album Saviour Machine I
"Legion", a song by Slaughter Lord, covered by At the Gates in the 2002 re-issue of the album Slaughter of the Soul
"Legion", a song by VNV Nation from the album Empires
"Legions", a song by Winds of Plague from the album Decimate the Weak

Sports
Legion Field, a stadium in Birmingham, Alabama
Legion Sports Complex, a complex in Wilmington, North Carolina
Legion Stadium (disambiguation)
Racine Legion, an American football team from 1922 to 1925

Other uses
Legion (demons), the collective name of the demons in the gospel account of the Gerasene demoniac
Legion Park (disambiguation)
Legion (taxonomy), a taxonomic rank in biology
Legion (software), a computer software system
Legion Interactive, an Australian telecommunications company
Catholic Legion (disambiguation)
Legionnaire (disambiguation)
Legionary