Donald David Dixon Ronald O'Connor (August 28, 1925 – September 27, 2003) was an American dancer, singer and actor. He came to fame in a series of films in which he co-starred with Gloria Jean, Peggy Ryan, and Francis the Talking Mule.

His best-known works came in the film Singin' in the Rain (1952), for which O'Connor was awarded a Golden Globe. He also won a Primetime Emmy Award from four nominations and received two stars on the Hollywood Walk of Fame.