"My Sweet Lord" is a song by the English musician George Harrison, released in November 1970 on his triple album All Things Must Pass. It was also released as a single, Harrison's first as a solo artist, and topped charts worldwide; it was the biggest-selling single of 1971 in the UK. In the United States and Britain, the song was the first number-one single by an ex-Beatle. Harrison originally gave the song to his fellow Apple Records artist Billy Preston to record; this version, which Harrison co-produced, appeared on Preston's Encouraging Words album in September 1970.

Harrison wrote "My Sweet Lord" in praise of the Hindu god Krishna, while intending the lyrics as a call to abandon religious sectarianism through his blending of the Hebrew word hallelujah with chants of "Hare Krishna" and Vedic prayer. The recording features producer Phil Spector's Wall of Sound treatment and heralded the arrival of Harrison's slide guitar technique, which one biographer described as "musically as distinctive a signature as the mark of Zorro". Ringo Starr, Eric Clapton, Gary Brooker, Bobby Whitlock and members of the group Badfinger are among the other musicians on the recording.

Later in the 1970s, "My Sweet Lord" was at the centre of a heavily publicised copyright infringement suit due to its alleged similarity to the Ronnie Mack song "He's So Fine", a 1963 hit for the New York girl group the Chiffons. In 1976, Harrison was found to have subconsciously plagiarised the song, a verdict that had repercussions throughout the music industry. Rather than the Chiffons song, he said he used the out-of-copyright Christian hymn "Oh Happy Day" as his inspiration for the melody.

Harrison performed "My Sweet Lord" at the Concert for Bangladesh in August 1971, and it remains the most popular composition from his post-Beatles career. He reworked it as "My Sweet Lord (2000)" for inclusion as a bonus track on the 30th-anniversary reissue of All Things Must Pass. Many artists have covered the song, most notably Edwin Starr, Johnny Mathis and Nina Simone. "My Sweet Lord" was ranked 454th on Rolling Stone's list of "the 500 Greatest Songs of All Time" in 2004 and 460th in the 2010 update and number 270 on a similar list published by the NME in 2014. It reached number one in Britain again when re-released in January 2002, two months after Harrison's death.

George Harrison began writing "My Sweet Lord" in December 1969, when he, Billy Preston and Eric Clapton were in Copenhagen, Denmark, as guest artists on Delaney & Bonnie's European tour. By this time, Harrison had already written the gospel-influenced "Hear Me Lord" and, with Preston, the African-American spiritual "Sing One for the Lord". He had also produced two religious-themed hit singles on the Beatles' Apple record label: Preston's "That's the Way God Planned It" and Radha Krishna Temple (London)'s "Hare Krishna Mantra". The latter was a musical adaptation of the 5,000-year-old Vaishnava Hindu mantra, performed by members of the International Society for Krishna Consciousness (ISKCON), colloquially known as "the Hare Krishna movement". Harrison wanted to fuse the messages of the Christian and Gaudiya Vaishnava faiths into what musical biographer Simon Leng terms "gospel incantation with a Vedic chant".

The Copenhagen stopover marked the end of the Delaney & Bonnie tour, with a three-night residency at the Falkoner Theatre on 10–12 December. According to Harrison's 1976 court testimony, "My Sweet Lord" was conceived while the band members were attending a backstage press conference and he had ducked out to an upstairs room at the theatre. Harrison recalled vamping chords on guitar and alternating between sung phrases of "hallelujah" and "Hare Krishna". He later took the idea to the others, and the chorus vocals were developed further.

Band leader Delaney Bramlett's later version of events is that the idea originated from Harrison asking him how to go about writing a genuine gospel song, and that Bramlett demonstrated by scat singing the words "Oh my Lord" while wife Bonnie and singer Rita Coolidge added gospel "hallelujah"s in reply. Music journalist John Harris has questioned the accuracy of Bramlett's account, however, comparing it to a fisherman's "It was this big"–type bragging story. Preston recalled that "My Sweet Lord" came about through Harrison asking him about writing gospel songs during the tour. Preston said he played some chords on a backstage piano and the Bramletts began singing "Oh my Lord" and "Hallelujah". According to Preston: "George took it from there and wrote the verses. It was very impromptu. We never thought it would be a hit."

Using as his inspiration the Edwin Hawkins Singers' rendition of an eighteenth-century Christian hymn, "Oh Happy Day", Harrison continued working on the theme. He completed the song, with help from Preston, once they had returned to London.