Karl Beck (1814 – 4 March 1879) was an Austrian operatic tenor who is notable for creating the title role in Richard Wagner's opera Lohengrin in Weimar, Germany in 1850. He also sang the title role in Hector Berlioz's opera Benvenuto Cellini in its first performance outside France, also in Weimar, in 1852. Both performances were marred by a deterioration in his vocal powers probably caused by a lingering infection. He ended his career as master baker to the Imperial Court in Vienna.