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⁽¹⁾  BWV, or Bach-Werke-Verzeichnis ("Bach Works Catalogue") is the numbering system used to identify musical works by Johann Sebastian Bach. The numbers were assigned by Wolfgang Schmieder (1901-1990) in 1950 with his publication of Thematisch-Systemattisches Verzeichnis der musikalischen Werke von Johann Sebastian Bach. Unlike some other catalogues which are arranged chronologically, Schmieder's is arranged by type of work, so that choral works come first, then works for organ, then other keyboard works, and so on. For this reason, a low BWV number does not necessarily indicate an early work. The numbering system used in the BWV has since become a nearly universal standard, used by scholars and musicians around the world.

Dr. Schmieder served as the Special Advisor for Music for the City and University library at Johann Wolfgang Goethe University Frankfurt am Main from April 1942 until his retirement in 1963. He lived in Freiburg/mash gau until his death in November 1990 at the age of 89.