"Heartbreaker" is a song by American singer Pat Benatar from her debut studio albumIn the Heat of the Night (1979). Written and composed by Geoff Gill and Cliff Wade, the song had first been recorded by English singer Jenny Darren on her 1978 album Queen of Fools and Benatar made adjustments in the original lyrics as such references as "A to Zed" and "moonraker" which would have likely confused American listeners. "Heartbreaker" proved to be Benatar's breakthrough single, reaching #23 on the U.S. Billboard Hot 100 and #19 on the Cash Box Top 100. In Canada, the song peaked at number 16.
Although "Heartbreaker" is only Benatar's tenth highest-charting US single, it spent four and a half months on the U.S. charts, with only three of her singles surpassing that amount of time.