Mass in A minor, BWV. Anh.24

The Mass in B minor (German: h-Moll-Messe), BWV 232, is an extended setting of the Mass ordinary by Johann Sebastian Bach. The composition was completed in 1749, the year before Bach's death, and was to a large extent based on earlier work, such as a Sanctus Bach had composed in 1724. Sections that were specifically composed to complete the Mass in the late 1740s include the "Et incarnatus est" part of the Credo. It is structured in four major sections and scored for five soloists, a choir that is five-part in many sections and divided in the "Osanna", and a Baroque ensemble including brass and wind instruments.

In the legacy of his son Carl Philipp Emanuel Bach, it appears as the "Great Catholic Mass" (die große catholische Messe), referring to the fact that all parts of the Catholic mass are set to music.