Gustav Neidlinger (March 21, 1910 – December 26, 1991) was a German bass-baritone, who was most famous for playing Wagner's "howling-and-spitting" villains. Born in Mainz, Neidlinger studied at the conservatory in Frankfurt, where he was trained by Otto Rottsieper. He debuted in 1931 at the Stadttheater in Mainz, where he sang until 1934. From 1934 to 1935, he was engaged at the Stadttheater in Plauen, Sachsen, and, from 1935 to 1950, he was a member of the opera in Hamburg.