A Lutheran chorale is a musical setting of a Lutheran hymn, intended to be sung by a congregation in a German Protestant Church service. The typical four-part setting of a chorale, in which the sopranos sing the melody along with three lower voices, is known as a chorale harmonization.

"A Mighty Fortress Is Our God" is one of the best known hymns by the Protestant Reformer Martin Luther, a prolific hymnwriter. Luther wrote the words and composed the hymn tune between 1527 and 1529. It has been translated into English at least seventy times and also into many other languages. The words are mostly original, although the first line paraphrases that of Psalm 46.