"Immortal" is a song by American hip hop recording artist Kid Cudi, released on March 14, 2013 as the third official single from his third studio album Indicud (2013). The song, produced by Cudi himself, samples "Congratulations", as performed by MGMT, with whom Cudi had collaborated on his 2010 single "Pursuit of Happiness". On March 26, 2013, Cudi appeared on Jimmy Kimmel Live! and performed "Immortal", as well as "Just What I Am", on the late-night talk show.

On October 29, 2012 Cudi announced he would be releasing the album's second official single at the end of November. On November 7, he revealed the upcoming single's title to be "Immortal", and that it again was produced by himself like the two previous releases, "Just What I Am" and "King Wizard". He claimed the song "will make you feel amazing in the heart and soul." However, on November 30, he revealed "Immortal" would not be released until 2013. "Immortal" was ultimately premiered on March 1, 2013 via SoundCloud. The song was produced by Cudi, with the main sample being a track from one of his favorite bands, MGMT's "Congratulations". He reversed the song, sped it up, and produced over it. The song was officially released via iTunes on March 14, 2013.

The song also contains a quote from American actor Adam Sandler in his 1995 film Billy Madison: "That’s one of my favorite movies, man. From my childhood, straight up. I love Adam Sandler. Throughout the album I wanted to include clips from some of my favorite movies to kind of narrate the album a bit and liven it up and give it some personality." Cudi claimed the quote, which is "I am the smartest man alive!", expressed his feelings best when he had completed the song:

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