Wolfgang Rehm was a German musicologist active mostly in music publishing, especially the Neue Mozart-Ausgabe. He was on the board of its editorial team for decades, and personally edited operas and piano music. While he worked on it for Bärenreiter in Kassel, he was responsible for the program of the Kasseler Musiktage festival, and after he moved for further work to Salzburg, he shaped the program of the Mozartwoche. He was also a member of the International Association of Music Libraries, Archives and Documentation Centres from 1959 to 1985, and also a founding member and treasurer of the Répertoire International des Sources Musicales data base.

The Neue Mozart-Ausgabe is the second complete works edition of the music of Wolfgang Amadeus Mozart. A longer and more formal title for the edition is Wolfgang Amadeus Mozart (1756–1791): Neue Ausgabe sämtlicher Werke [Wolfgang Amadeus Mozart (1756–1791): New Edition of the Complete Works].