Dieter Acker (3 November 1940 – 27 May 2006) was a German composer born in Sibiu, Romania.
In 1969, Acker moved from Transylvania (Romania) to Germany for political and artistic reasons.
He later attended the Munich conservatory where in 1976 he received a professorship in composition.
Acker taught a number of students that later became prominent composers, such as Wolfram Buchenberg, Ferran Cruixent, Oriol Cruixent, Marius Ruhlan, Florian Heigenhauser, Peter Wittrich and others.
Dieter Acker wrote well over a hundred works, including orchestral compositions, six symphonies, instrumental concertos, and chamber music.