"I'll Be There for You" is a song by American rock band Bon Jovi from their 1988 album New Jersey. It was written by Jon Bon Jovi and Richie Sambora. The song ranked at number one on the Billboard Hot 100 and #5 on the Mainstream rock charts.

Originally released on the 1988 album New Jersey, it became the band's third single from the album when it was released as a single in 1989. As the band (and hard rock music) was at its peak popularity at this time, the song quickly climbed to the number one position on the Billboard Hot 100, becoming their fourth and final number one single. The song has remained as one of Bon Jovi's signature songs and a classic in the power ballad genre. The song was also a peek into a more mature sound heard on their following albums Keep the Faith and These Days.

Some think the verses have an eerily and uncredited similarity (both musically and melodically) to John Lennon's Beatles' track "Don't Let Me Down" (recorded during the Get Back sessions) and the chorus was claimed, by some fans of the late 1980s hard rock genre, to have been culled from an unreleased song by Joel Ellis of Cats in Boots and Heavy Bones. Ellis has said that Lehua Reid (Richie Sambora's ex-fiancée) regaled him with anecdotes regarding Jon Bon Jovi and Richie Sambora "sitting at the piano for hours with a box full of tapes they got from people and going through the songs looking for stuff they could rip off and laughing about it, your [Ellis'] song was played over and over and over."

On March 16, 2011, James Durbin performed the song on the 10th season of American Idol.

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