Günther Massenkeil (11 March 1926 – 17 December 2014) was a German musicologist, academic teacher, writer and concert singer (baritone). His main field of research was sacred music of the 16th to 20th century. He served as director of the musicology department at the University of Bonn from 1966 to 1991. He became known beyond academia for his editing and supplementing of the eight-volume encyclopaedia, Das Große Lexikon der Musik.