"Heartbeat" is a rockabilly song credited to Bob Montgomery and Norman Petty and originally recorded by Buddy Holly in 1958. The B-side of the single was "Well... All Right" (Buddy Holly, Norman Petty, Jerry Allison, Joe Mauldin).

"Heartbeat" was the last of Holly's singles to be released during his lifetime. It was a minor hit in the United States, reaching number 82 on the Billboard Hot 100 chart.

Holly's single had more chart impact in the UK, reaching number 30 in January 1959 and again upon its reissue in April 1960. In the interim between the two UK chartings of the Holly original, a remake by the England Sisters (catalogue number HMV POP 710) reached number 33 in the UK.

"Heartbeat" subsequently reached the UK Top Ten twice. Firstly in 1975 for Showaddywaddy, number 7 that September, and again in 1992 when the version Nick Berry recorded as the theme to the television series Heartbeat (in which Berry starred) reached number 2 that June.

Versions of "Heartbeat" have appeared on albums by:

The B-side of the single, "Well... All Right", was covered by:

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