Gustav Siehr (17 September 1837 – 18 May 1896) was a German Hofoper- and Kammersänger bass.
Born in Arnsberg, Province of Westphalia, as the son of a senior government councillor, Siehr first studied medicine at University of Königsberg. In 1858, he became a member of the .[1] As an inaktive, he moved to the University of Jena and the Humboldt University of Berlin. In Berlin, he decided to train his voice with Julius Krause and Heinrich Dorn. In 1863, he made his debut at the in Bellini's Norma. In 1864–65, he was at the Gothenburg German Opera House, in 1865–70 at the German Theatre Prague, in 1870–81 at the Hessisches Staatstheater Wiesbaden. In 1881, he went to the Bayerische Staatsoper, of which he remained a member until the end of his life. Siehr was considered a great interpreter of the operas of Richard Wagner. He sang repeatedly at the Bayreuth Festivals, roles such as Hagen in the world premiere of Götterdämmerung on 17 August 1876 at the first Festival, Gurnemanz in Parsifal at the 1882–84, 1886 and 1889 festivals, and as King Marke in the at the 1886 Festival. He also sang Gurnemanz in the for the Bavarian King Ludwig II of Bavaria at the National Theatre Munich. Wagner held the singer in high esteem.[2] He described his vocal delivery and art of characterisation as outstanding.
Siehr died in Munich at the age of 58.