Louis Saguer, born Wolfgang Simoni, (26 March 1907 – 1 March 1991) was a composer of German origin who became a naturalized French citizen in 1947.
Simoni was born in Berlin-Charlottenburg. After studying piano, composition and conducting at the Stern Conservatory in Berlin, he became Edmund Meisel's collaborator for the music of several films (Sergei Eisenstein's Battleship Potemkin, , Arnold Fanck's The Holy Mountain).
Head of singing, assistant director and choreographer at the Berlin State Opera, conductor and assistant director at the Piscator Theatre, he continued his orchestration training work in 1929 in Paris where he settled permanently a few years later. After a difficult start, he became conductor of the Chorale populaire de Paris, close to the Communist Party. He composed songs and occasional works.
Saguer died in 1991 in Paris at the age of 83.