Barry Dennen (born February 22, 1938, Chicago, Illinois, USA – died September 26, 2017, Burbank, California, USA) was an American actor, singer and writer.

In New York City from 1960 to 1963, he had a relationship with Barbra Streisand, during which time he helped her develop the nightclub act that began her successful career as a singer and actress. He moved to London for fifteen years and in 1968 landed the starring role of the master of ceremonies in the London version of Cabaret. In 1970, he played Pontius Pilate on the album of Jesus Christ Superstar, and he played the same role in the Broadway production (1971), then in the movie in 1973. He also had a variety of small parts on American television shows and films and performed voice-overs for video games.