Robert Marshall Watts (1923–1988) was an American artist best known for his work as a member of the international group of artists Fluxus. Born in Burlington, Iowa June 14, 1923, he became Professor of Art at Douglass College, Rutgers University, New Jersey in 1953, a post he kept until 1984. In the 1950s, he was in close contact with other teachers at Rutgers including Allan Kaprow, Geoffrey Hendricks, and Roy Lichtenstein. This has led some critics to claim that pop art and conceptual art began at Rutgers.

He organised the proto-fluxus Yam Festival, May 1963 with George Brecht, and was one of the main protagonists, along with George Maciunas, in turning SoHo, New York, into an artist's quarter. He died September 2, 1988, of lung cancer in Martins Creek, Pennsylvania.