Ach Gott, vom Himmel sieh darein, BWV 2

Ach Gott, vom Himmel sieh darein
BWV 2
Chorale cantata by J. S. Bach
Thomaskirche, Leipzig 1885
Occasion	Second Sunday after Trinity
Performed	18 June 1724 (1724-06-18): Leipzig
Movements	6
Cantata text	anonymous
Chorale	"Ach Gott, vom Himmel sieh darein" by Martin Luther
Vocal	SATB choir solo: alto, tenor and bass
Instrumental	2 oboes 4 trombones 2 violins viola continuo

Ach Gott, vom Himmel sieh darein (Oh God, look down from heaven),BWV 2, is a church cantata by Johann Sebastian Bach, composed in Leipzig for the second Sunday after Trinity and first performed on 18 June 1724. It is the second cantata of his second annual cycle of chorale cantatas, and is based on Martin Luther's hymn "Ach Gott, vom Himmel sieh darein", published in 1524 in the first Lutheran hymnal.

Bach composed the cantata for the Second Sunday after Trinity in Leipzig as the second cantata of his second annual cycle, which began a week before with O Ewigkeit, du Donnerwort, BWV 20. The prescribed readings for the Sunday were from the First Epistle of John, "He that loveth not his brother abideth in death" (), and from the Gospel of Luke, the parable of the great banquet (). The cantata is based on the six-stanza chorale Ach Gott, vom Himmel sieh darein, published by Martin Luther in 1524 in the Achtliederbuch, paraphrasing Psalm 12. The words are used unchanged in movements 1 and 6. An unknown poet transcribed the ideas of stanzas 2–5 into recitatives and arias. Bach first performed the cantata on 18 June 1724.