"World on Fire" is a song by American hard rock guitarist Slash, featuring vocalist Myles Kennedy and backing band The Conspirators. Written by Slash and Kennedy, it is the title track of the guitarist's third solo album (the second with Kennedy and The Conspirators) World on Fire. Released as the album's lead single, "World on Fire" topped the US Billboard Mainstream Rock Songs chart.

As is the case with the majority of songs on the album, the origins of "World on Fire" come from a period of writing during touring for the predecessor to World on Fire, 2012's Apocalyptic Love. Two separate ideas written by Slash were introduced to the rest of the band, at which point they were "morphed together" into what became "World on Fire".

The title track was one of the first songs to be developed during the album's pre-production phase in October 2013 at Mates Rehearsal Studio in North Hollywood, Los Angeles, California, along with "Withered Delilah" and "Stone Blind". The basic backing track was completed by the end of the year, recorded at NRG Studios in Los Angeles; the track was finished in March 2014 at producer Mike "Elvis" Baskette's Barbarosa Studios in Orlando, Florida, and mixed and mastered in May at Sterling Sound in New York City, New York.

Slash has described "World on Fire" as a "signature song" of the band due to its "tempo and aggression". According to the guitarist, the song is "all about sex", something which influenced the direction vocalist Kennedy took when writing its lyrics. The working title for the song was "I Wanna Pull Your Hair", relating to its sexual nature. Bassist Todd Kerns describes the song as a "barn-burner", praising both the main guitar riff and Kennedy's vocal performance on the track.

Speaking about the lyrical content of "World on Fire", Kennedy explains that "The title track is about seizing the day and living for the moment. Above all, it's about living your life with no regrets. Doing what you want – doing whatever makes you happy. Carpe diem." In a track-by-track interview about the album for Total Guitar magazine, Kennedy noted that the melody for the vocal line "came relatively quickly", but that the theme and content of the lyrics themselves took longer to finalise.

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