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The Bach-Werke-Verzeichnis (BWV; English. Bach works catalogue; German: ( Bach-Werke-Verzeichnis ) is a catalogue of compositions by Johann Sebastian Bach. It was first published in 1950, edited by Wolfgang Schmieder. The catalogue's second edition appeared in 1990. An abbreviated version of that second edition, known as BWV 2a, was published in 1998. BWV numbers were assigned to 1,126 compositions in the 20th century, and more have been added to the catalogue in the 21st century. The Anhang (Anh.; Annex) of the BWV lists over 200 lost, doubtful and spurious compositions.

The first edition of the Bach-Werke-Verzeichnis was published in 1950. It allocated a unique number to every known composition by Bach. Wolfgang Schmieder, the editor of that catalogue, grouped the compositions by genre, largely following the 19th-century Bach Gesellschaft (BG) edition for the collation (e.g. BG cantata number = BWV number of the cantata):

Kantaten (Cantatas), BWV 1–224

Motetten (Motets), BWV 225–231

Messen, Messensätze, Magnificat (Masses, Mass movements, Magnificat), BWV 232–243

Passionen, Oratorien (Passions, Oratorios), BWV 244–249

Vierstimmige Choräle (Four-part chorales), BWV 250–438

Lieder, Arien, Quodlibet (Songs, Arias and Quodlibet), BWV 439–524

Werke für Orgel (Works for organ), BWV 525–771

Werke für Klavier (Keyboard compositions), BWV 772–994

Werke für Laute (Lute compositions), BWV 995–1000

Kammermusik (Chamber music), BWV 1001–1040

Orchesterwerke (Works for orchestra), BWV 1041–1071, originally in two separate chapters: Concertos (BWV 1041–1065) and Overtures (BWV 1066–1071)

Kanons (Canons), BWV 1072–1078

Musikalisches Opfer, Kunst der Fuge (Musical Offering, Art of the Fugue), BWV 1079–1080

The Anhang of the BWV listed works that were not suitable for the main catalogue, in three sections:

I – lost works, or works of which only a tiny fraction had survived (Anh. 1–23)

II – works of dubious authenticity (Anh. 24–155)

III – works that were once attributed to Bach, but for which it had been established they were not composed by him (Anh. 156–189)

Within each section of the Anhang the works are sorted by genre, following the same sequence of genres as the main catalogue. Schmieder published the BWV's second edition in 1990, with some modifications regarding authenticity discriminations, and more works added to the main catalogue and the Anhang. Several compositions were repositioned in the over-all structure of chapters organised by genre and Anhang sections. In 1998 Alfred Dürr and Yoshitake Kobayashi published a small edition of the catalogue, based on the 1990 second edition. This edition, known as BWV 2a, contained a few further updates and collation rearrangements.

New additions (Nachträge) to BWV2/BWV2a included:

BWV 1081–1126

BWV Anh. 190–213

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