John Rubinstein (born December 8, 1946) is an American actor, composer and director.

Early life
Rubinstein is the son of Polish parents. His mother, Aniela (née Młynarska), a dancer and writer, was a Roman Catholic native of Warsaw, the daughter of conductor Emil Młynarski. His father was Polish-Jewish concert pianist Arthur Rubinstein. He attended El Rodeo Public School in Beverly Hills (K–2), Cours La Cascade in Paris, France (1954), and St. Bernard's School (3–8) and Collegiate School (New York City) (9–12) in New York City. He studied theater and music at the University of California, Los Angeles (1964–1967), and later composition at the Juilliard School in New York.