Jacobowsky und der Oberst, Op. 49, (Jacobovsky and the Colonel) is an opera in four acts by Giselher Klebe who also wrote the libretto based on the 1944 play by Franz Werfel. It premiered on 2 November 1965 at the Hamburg State Opera which had commissioned the work. Klebe dedicated it to the then director of the Staatsoper, Rolf Liebermann.