Heart Attack (Demi Lovato song)

"Heart Attack" is a song recorded by American singer Demi Lovato. The song was released on February 25, 2013, as the lead single from her fourth studio album Demi (2013). It was produced by Mitch Allan, and Jason Evigan of "The Suspex", who co-wrote the song along with Lovato, Sean Douglas, Nikki Williams, and Aaron Phillips. "Heart Attack" is an electropop song that employs cardiac motifs to represent the fear of falling in love. It received acclaim from music critics, many of whom complimented its lyrics and Lovato's vocals.

The song sold 215,000 copies in the US in its first week, her best sales week for a song download, and peaked at number ten on the US Billboard Hot 100, becoming Lovato's second solo top-ten single on the chart. It was later certified 5× platinum by the Recording Industry Association of America (RIAA). "Heart Attack" also performed well internationally, reaching the top 10 in Canada, Ireland, Lebanon, New Zealand, Scotland, and the United Kingdom.

An accompanying music video for "Heart Attack" was directed by Chris Applebaum and was premiered through Vevo on April 9, 2013. Lovato has performed the track on several television programs and has also included the song on the setlists for The Neon Lights Tour, Demi World Tour, Future Now Tour, Tell Me You Love Me World Tour, and Holy Fvck Tour. A re-recorded rock version was released on March 24, 2023, and included on her first remix album titled Revamped.