Duncan Renaldo (born April 23, 1904?, Oancea, Romania?—died September 3, 1980, Santa Barbara, California, U.S.) was an actor who was best known for his role in the popular western television series The Cisco Kid (1951–56).
Renaldo, who was an orphan, was uncertain of his origins. Romania and Spain have been proposed as his birthplace, and his birth date is likewise customary rather than factual. He was working as a stoker on a Brazilian ship in 1922 when the ship on which he was working burned at the dock, stranding him in the United States. He went to Hollywood in 1926, and Metro-Goldwyn-Mayer (MGM) signed him as an actor in 1928. Renaldo played in a number of films, including The Bridge of San Luis Rey (1929). A few years after the film Trader Horn (1931) was released, Renaldo was arrested for falsifying his birthplace—he said he was born in New Jersey—to obtain a passport. After serving 18 months in prison for perjury, he was pardoned by Pres. Franklin D. Roosevelt. Before long he was acting in westerns. He made 159 television episodes as the Cisco Kid as well as many feature films in that role. The Cisco Kid and his sidekick, Pancho (Leo Carillo), corralled outlaws in the Old West without ever killing them. Renaldo also made several westerns with Roy Rogers and Gene Autry.