Otto Wiener (February 13, 1911 – August 5, 2000) was an Austrian baritone, notable for his performances in the operas of Richard Wagner.
He appeared at the Salzburg Festival in 1955 and sang there in the stage première of Frank Martin's Le mystère de la Nativité.
He was cast in roles usually reserved for deeper, darker voices because his technique was so relaxed, well-projected, and free.
Besides the above-listed roles, he is on record as Faninal in Der Rosenkavalier, the Heerrufer in Lohengrin, Ottavio in The Coronation of Poppea, and Wotan/Wanderer in The Ring of the Nibelung.
His non-opera recordings include Beethoven's Missa Solemnis and Ninth Symphony, Haydn's Seven Last Words of Christ, Bach's St. Matthew Passion, and Brahms' A German Requiem.