"Sour Milk Sea" is a song by the English rock singer Jackie Lomax that was released as his debut single on the Beatles' Apple record label in August 1968. It was written by George Harrison during the Beatles' stay in Rishikesh, India, and given to Lomax to help launch Apple Records. The song's recording was the first of many extracurricular musical projects undertaken by Harrison, who produced the track, and a rarity among non-Beatles songs since it features contributions from three members of the band. Along with Harrison, Ringo Starr and Paul McCartney, the musicians on the track were Eric Clapton and session pianist Nicky Hopkins.

Harrison wrote "Sour Milk Sea" to promote Transcendental Meditation, which the Beatles had been studying in Rishikesh with Maharishi Mahesh Yogi. The group recorded a demo of the song while considering material for their 1968 double album, The Beatles (also known as the White Album). On release, Lomax's single was overshadowed in Apple's "Our First Four" promotional campaign by the Beatles' "Hey Jude" and Mary Hopkin's "Those Were the Days"; it enjoyed only minor success internationally, becoming a top 30 hit in Canada. Together with its B-side, the Lomax-written "The Eagle Laughs at You", the song was included on the singer's only Apple album, Is This What You Want?, released in March 1969.

"Sour Milk Sea" received favourable reviews in 1968 and has continued to invite praise from music critics, particularly for the energetic quality of the performance. Several writers consider that the song deserved to be a hit for Lomax and that, had the Beatles retained it for the White Album, it would have been among the best songs on the album. The track also appears on the 2010 multi-artist compilation Come and Get It: The Best of Apple Records.

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