Thomas F. Ertelt (born 5 April 1955) is a German musicologist.
Born in Weingarten, Ertelt studied musicology and Germanistic at the Freie Universität Berlin (with Rudolf Stephan).
In 1989 he received his doctorate with his work on A. Berg's opera Lulu.
In 1992, Ertelt went to the Berlin Musical Instrument Museum of the Staatliches Institut für Musikforschung Berlin (SIMPK) and has been working there in leading positions as successor of Dagmar Droysen-Reber since 1994.
He is publisher of the Geschichte der Musiktheorie,[2] correspondence of members of the Viennese School, and the series Klang und Begriff.