Robert Lewis (March 16, 1909 - November 23, 1997) was an American actor, director, teacher, author and founder of the influential Actors Studio in New York in 1947.

In addition to his accomplishments on Broadway and in Hollywood, Lewis' greatest and longest lasting contribution to American theater may be the role he played as one of the foremost acting and directing teachers of his day. He was an early proponent of the Stanislavski System of acting