René Mercier (end of the 19th century – 1 January 1973) was a 20th-century French composer and conductor.
He never got very big personal success, apart from a few songs: : Elle s'était fait couper les cheveux, in reference to the flappers of the 1920s.
On ne passe pas [fr], written during the war (1916) remains one of his great success, due to the circumstances.
After World War II, he was conductor in various music halls, including the ABC from 1948 to 1955.
At the Théâtre des Capucines, he composed the 1945 review with Raoul Moretti.