Siegfried Matthus (13 April 1934 – 27 August 2021) was a German composer, conductor, and festival founder and manager. Some of his operas, such as Judith, were premiered at the Komische Oper Berlin in East Berlin. In 1991, he founded the chamber opera festival Kammeroper Schloss Rheinsberg and directed it until 2018. In 2005, he composed a Te Deum for the reopening of the Dresden Frauenkirche. Matthus is considered one of Germany's most often performed contemporary composers.