"Deadcrush" is a song by British indie rock band alt-J. It is the fifth track and fourth single from their third studio album, Relaxer, and was released as a digital single on 12 July 2017 by Infectious Music and Atlantic Records. The song was written by Joe Newman, Gus Unger-Hamiltion, and Thom Sonny Green and produced by Charlie Andrew. The song's title is based on a game the band played where they asked the question, "What historical figure would I want to take on a date if she were alive today?", and so the name "Deadcrush" is based on someone's "dead crush".

A music video for the song was released on 12 July 2017. It was directed by Young Replicant, who also directed their 3WW video. It features the band's "dead crushes": Sylvia Plath, Lee Miller, and Anne Boleyn teaming up in a post-apocalyptic world.

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