"Someone Saved My Life Tonight" is an Elton John song from his album Captain Fantastic and the Brown Dirt Cowboy. John originally wrote and recorded it in A-flat, though after vocal cord surgery in 1987 that resulted in him abstaining from using his falsetto range for a period, he more often performed the song in a lower key of F. It concludes side one in the album's narrative, which chronicles the early history of John and lyricist Bernie Taupin and their struggles to find their place within the music industry. When released as the album's only single in 1975, it was the first album to ever enter at #1 in the history of music on the Billboard Hot 100 and entered the top 25 on the UK Singles Chart. In the U.S., it was certified Gold on 10 September 1975 by the RIAA. In Canada, the single narrowly missed being his ninth number one there, hitting #2 on the RPM 100 national Top Singles chart on August 30.

Taupin's lyric refers to a time in 1969, before John was a popular musician, when John was engaged to be married to his girlfriend, Linda Woodrow. John and Woodrow were sharing a flat with Taupin in Furlong Road in London, hence the opening line "When I think of those East End lights." While having serious doubts about the looming marriage, John contemplated suicide. He took refuge in his friends, especially Long John Baldry, who convinced John to abandon his plans to marry in order to salvage and maintain his musical career. Comparisons can also be drawn to the earlier John/Taupin composition Skyline Pigeon - as both songs contain the metaphor of a creature flying free towards the sky to signify escape from marriage. As a sign of his respect and gratitude for Baldry, Taupin wrote him into the song as the "someone" in the title, and also as "Sugar Bear". Some radio stations altered the song or refused to play it due to the use of the phrase "Damn it" in the second verse.

In the liner notes to the Deluxe Edition of Captain Fantastic and The Brown Dirt Cowboy, writer Paul Gambaccini related a recollection from producer Gus Dudgeon. During the recording of the song's lead vocal, Dudgeon said he was pushing Elton for more in terms of his delivery of the vocal, not paying attention to the lyric. According to Gambaccini, another member of the production crew, Davey Johnstone, leaned over and told Dudgeon, "You know he's singing about killing himself." Dudgeon was apparently mortified by the revelation and relented.

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