"Welcome to the Jungle" is a song by American rock band Guns N' Roses, featured on their debut album, Appetite for Destruction (1987). It was released as the album's second single initially in the UK in September 1987 then again in October 1988 this time including the US, where it reached number seven on the Billboard Hot 100 and number 24 on the UK Singles Chart.

On the 1987 release, the Maxi Single format was backed with a live version of AC/DC's Whole Lotta Rosie, the band's debut single It's So Easy and Bob Dylan's Knockin' On Heaven's Door. In 2009 "Welcome to the Jungle" was named the greatest hard rock song of all time by VH1.

Axl Rose wrote the words while visiting a friend in Seattle. "It's a big city, but at the same time, it's still a small city compared to L.A. and the things that you're gonna learn. It seemed a lot more rural up there. I just wrote how it looked to me. If someone comes to town and they want to find something, they can find whatever they want." Rhythm guitarist Izzy Stradlin summarises the song as "about Hollywood streets; true to life."

Slash describes the development of the music of "Welcome to the Jungle" in his self-titled autobiography. As the band was trying to write new material, Axl remembered a riff Slash had played while he was living in the basement of Slash's mother's house. He played it and the band quickly laid down the foundations for the song, as Slash continued coming up with new guitar parts for it. He credits Duff McKagan as coming up with the breakdown. Duff contradicts this in his autobiography, It's So Easy (and other Lies), saying it was from a song called "The Fake" that he wrote in 1978 for the Vains, a punk band he was in. He also said it was the first song he ever wrote, and that it was later released as a single by the band. According to Slash, the song was written in approximately three hours.

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