Franz Rupp (February 24, 1901 – May 27, 1992) was a German-American pianist and accompanist.
Franz Rupp was born in the town of Schongau, Bavaria, the son of Ludwig and Lina Rupp, née Gartner. In 1912 his father was transferred to the revenue office in Munich. Rupp studied at the Akademie der Tonkunst in Munich from 1916 – 1922. Among his teachers were , Friedrich Klose und . In 1920 he undertook his first American tour with the violinist Willy Burmester. From 1926 he lived in Berlin and established his reputation as an accompanist. He married Warsaw-born opera singer Stephanie Schwarz in 1930. From 1927 to 1934 he was the constant accompanist of the famous German baritone Heinrich Schlusnus, but he fell out with him when the singer made a career under the National Socialists. As Rupp's wife was Jewish he was no longer allowed to perform in public. But he accompanied the outstanding Austrian violinist and composer Fritz Kreisler, with whom he went to tour South America in 1935. Kreisler recorded Beethoven’s complete violin sonatas with Rupp in London in 1935/36.
Rupp also accompanied singers Lotte Lehmann, Sigrid Onégin, Maria Stader and Beniamino Gigli, and was a highly esteemed chamber musician who, among others, performed with cellist Emanuel Feuermann and violist William Primrose. He also played as a soloist with various German conductors, among them Wilhelm Furtwängler.
In 1938 he moved permanently to New York and soon became the permanent accompanist of black contralto Marian Anderson, until her retirement from the stage in 1965. Anderson gives credit to Franz and Stephanie Rupp in her autobiography My Lord, What a Morning.