"Stray Heart" is a song by American punk rock band Green Day. The song was recorded by the band for their tenth studio album, ¡Dos!. It was released as the only single from the album in Europe and Australia on October 15, 2012.

The single was certified gold by the Federation of the Italian Music Industry for downloads exceeding 15,000 units in Italy.

"Stray Heart" premiered on Idiot Club, Green Day's official fan club, on October 8, 2012 and premiered on Zane Lowe's BBC Radio 1 show on the same day. It was then released as the album's lead single on October 15 in the UK. On October 18, it was announced on Idiot Club that fans could go to downtown LA to appear in the music video for the song on October 19.

"Stray Heart" was also played by Foxboro Hot Tubs as both a warm up song and a practice song.

"Stray Heart" blends the pop punk sound of Green Day with the garage rock sound of their side project Foxboro Hot Tubs.

The song has been described as "an amped-up Motown bounce recalling Britpop progenitors The Jam's classic "A Town Called Malice", but with speaker-bursting modern-rock dynamics".

On November 7, 2012, a music video for "Stray Heart" was released. The video starts with a man (Alex Knox) looking for records at a record store and buying some Green Day vinyl including ¡Uno!, ¡Dos! and ¡Tré!, but as he gives the records to his girlfriend (Leven Rambin), she sees a hole in his chest where his heart should be, and she slams the door on him. As the man is walking down the street, he gets strange reactions and sees trails of blood on the pavements. He follows the trail and chases the heart around the town, where he finally gets to it outside the girl's apartment, where she throws the records back at him. The video was directed by Robert Schober (aka RoboSchobo).

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