"Don't Let It Break Your Heart" is a song by British rock band Coldplay and the penultimate track from their fifth studio album Mylo Xyloto. Recorded in the latter stages of the Mylo Xyloto recording sessions, "Don't Let It Break Your Heart" is a song mixed in with the familiar chords and notes of "Mylo Xyloto" and Coldplay's 2008 hit single, '"Viva la Vida".
"A sister-track to 'Every Teardrop'... in the way its driven by stop-start rhythm of the drums and the way Martin forms an indelible hook out of the wall of sound sonic avalanches around him, 'Don't Let It Break Your Heart' is one of Mylo Xyloto's most straightforward songs, a precursor, alaA Rush Of Blood...'s 'A Whisper', before a final bombastic blow-out?"
The song was first performed live during the third phase of the Mylo Xyloto Tour. It would become part of the final setlist for the tour, being performed throughout the band's stadium tours and forthcoming arena tours. The song was also recorded for the band's third live album, Live 2012, but was scratched, instead being a DVD extra.