"Afterworld" is a song by American heavy metal band CKY. Written by Chad I Ginsburg and Deron Miller, it was originally featured on the soundtrack to the 2010 film Jackass 3D, and was later included on the band's 2011 compilation album B-Sides & Rarities. The song is the band's first to feature Ginsburg on lead vocals, and it was released as a single on September 30, 2010.

CKY first began working on "Afterworld" during recording sessions for the band's 2009 fourth studio album Carver City. The band's frontman Deron Miller originally wrote the music for the song and recorded the basic guitar riffs, although it was later shelved and not completed in time to be considered for inclusion on the album. During a later session in which the band was tasked with recording a song for inclusion on Jackass 3D, guitarist Chad I Ginsburg wrote the lyrics (after watching an early screening of the film) and recorded the vocals and remaining instrumental parts for "Afterworld" while Miller was out of the studio buying food for the group.

Speaking about the themes of the song in a behind the scenes interview, Ginsburg explained that the majority of the lyrics were written in relation to "being a stuntman", in line with the content of the Jackass TV series and films. Miller added to this explanation by noting that Ginsburg and the band based the song on Jackass 3D and "tried to make it about just going for it – in stunts and stuff like that". Ginsburg also revealed that the line "We'll never die in the afterworld" in the chorus was originally intended to be "We'll never die in the 3D world", although it was eventually changed due to the association with Jackass 3D being "overkill" according to Bam Margera.

"Afterworld" was first released as a digital download single on iTunes and Amazon.com on September 30, 2010 alongside an acoustic recording of Carver City closing track "Era of an End". After being featured in the film's closing credits, the track was later included on the Jackass 3D soundtrack on October 25. The following March, it was included as the opening track on the compilation album B-Sides & Rarities.

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