"Oh, Boy!" is a song written by Sonny West, Bill Tilghman and Norman Petty. It was originally recorded by Sonny West in the late 1950s but did not achieve commercial success. It was later recorded by Buddy Holly and the Crickets between June 29 and July 1, 1957, at Petty Studios in Clovis, New Mexico, with Holly singing lead vocals and the Picks providing backing vocals. The song is in an A-A-B-A format with a 12-bar blues verse and an 8-bar bridge. (Holly also covered another West song, "Rave On".)

The song was included on the album The "Chirping" Crickets and was also released as the A-side of a single, with "Not Fade Away" as the B-side. The song peaked at number 10 on the US charts, and number 3 on the UK charts in early 1958. (See 1958 in music for more context.)

"Oh Boy!" was covered by British glam rock group Mud. It reached number 1 for two weeks on the UK Singles Chart in May 1975. It was the band's third and final UK number one. It was included on their album Mud Rock Volume 2, which reached number 6 in the UK Albums Chart.

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