"King Kong Song" (working title "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. The songwriters later considered it one of their weakest tracks.

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 number 4. "King Kong Song" was the international B-side to "Honey, Honey" and the B-side to "I've Been Waiting for You" in New Zealand and in Australia, where it reached number 49.