Helmut Loos (born 5 July 1950) is a German musicologist and emeritus scholar.
Born in Niederkrüchten, Loos studied music education from 1971 to 1974 and musicology, art history and philosophy from 1974 to 1980 at the University of Bonn.
From 1989 to 1993 Loos was director of the Institute for German Music in the East in Bergisch Gladbach.
In April 1993 he was appointed to the chair of historical musicology at the Technical University of Chemnitz.
From October 2001 to March 2017 he held a professorship at the Institute for Musicology of the University of Leipzig [de].