Warum betrübst du dich, mein Herz

"Warum betrübst du dich, mein Herz" (Why are you afflicted, my heart) is a Lutheran hymn. According to some sources, both hymn writer and composer are anonymous. The melody, Zahn No. 1689a, appeared on broadsides from the mid-16th century in Nürnberg, one of them dated 1561. For a while the tune had been attributed to Hans Sachs.

Johann Sebastian composed a chorale cantata on the hymn, Warum betrübst du dich, mein Herz, BWV 138.