"My Perfect Cousin" is a punk rock song originally written and recorded by Northern Irish band The Undertones. The song — inspired by an actual male cousin of one of the band members — was written during the summer of 1979 and recorded at Wisseloord Studios in Hilversum in December 1979.

"My Perfect Cousin" was the first of two singles to be released from the band's Hypnotised LP (the second being "Wednesday Week"), and was released on 28 March 1980. The single reached number 9 in the UK Singles Chart two months later, making it The Undertones' only Top 10 single.

The song was the sixth single released by The Undertones, and the first single to be written by band members Damian O'Neill and Michael Bradley. The official music video to the song was largely filmed at the home of the O'Neill brothers, and was directed by Julien Temple,

"My Perfect Cousin" was performed on Top of the Pops on two occasions: 3 April and 10 April 1980.

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