Was Gott tut, das ist wohlgetan, BWV 100, is a church cantata by Johann Sebastian Bach. He composed it in Leipzig between 1732 and 1735. The chorale cantata is based on the hymn "Was Gott tut, das ist wohlgetan" Samuel Rodigast (1674).

"Was Gott tut, das ist wohlgetan" is a Lutheran hymn written by the pietist German poet and schoolmaster Samuel Rodigast in 1675. The melody has been attributed to the cantor Severus Gastorius. An earlier hymn with the same title was written in the first half of the seventeenth century by the theologian Michael Altenburg.