"King Kong Song" (originally "Mr. Sex"), written and composed by Benny Andersson and Björn Ulvaeus, is the name of a 1974 recording by Swedish pop group ABBA, included on their album Waterloo. In 1977, the track was released as a single to coincide with the re-release of the movie King Kong, which charted at #94 in Australia, where it had previously been the B-side to "I've Been Waiting for You". It received a substantial amount of unsolicited airplay in Sweden, even though by then three years and two albums had come and gone since its original 1974 conception. The song bears a resemblance to the style of the Beach Boys.

In 1974, the song competed in the Swedish radio chart show Tio i topp, where it stayed in the charts for four shows and peaked at #4. Also in Sweden, "King Kong Song" was the B-side to "Honey, Honey".

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