Gerhard Allroggen (born 19 May 1936) is a German musicologist and emeritus University professor from Detmold and Paderborn.
From 1977, he was professor at the Musikwissenschaftliches Seminar Detmold/Paderborn [de] of the Hochschule für Musik Detmold.
From 1991 to 1995, he was also vice-rector of the Paderborn University.
Allroggen's research interests include the music and musical aesthetics of early German Romanticism, Wolfgang Amadeus Mozart, and the Neapolitan Opera of the late 18th century.
Allroggen was a member of the Neue Mozart-Ausgabe, co-editor of the complete edition of the literary works of E. T. A. Hoffmann, and is currently leader of the Carl-Maria-von-Weber-Gesamtausgabe.