Robert Lewis (1909 – 1997) was an American actor, director, teacher, author and founder of the 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 technique and a founding member of New York's revolutionary Group Theatre in the 1930s. In the 1970s, he was the Head of the Yale School of Drama Acting and Directing Departments.