"Cross My Heart" is a 1988 song recorded by British pop band Eighth Wonder. It was the second single from the album Fearless and group's sixth single, and was released in 1988. It which proved to be almost as successful chart wise as "I'm Not Scared", reaching the top ten in Italy, Norway and Switzerland, and the top twenty in France, Germany and United Kingdom. It was a minor success in the US, peaking at number 56, but remains the band's only American top 75 hit single. The video was directed by Dieter 'Dee' Trattmann.

In 1988, the song was covered by Martika on her eponymous debut album, on which it features as the second track. Also in 1988, Tracie Spencer covered the song for her self entitled debut album. Also in 1988, Hong Kong pop singer Sandy Lam recorded a Cantonese cover version of the song, titled "Once We've Touched (一接觸)" for her sixth album City Rhythm.

These are the formats and track listings of major single releases of "Cross My Heart":

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