Duncan Renaldo (1904–1980) was an American actor of European birth. He was best known in the 1950s United States for his lead role in The Cisco Kid, which co-starred Leo Carrillo as Pancho. The children's television series ran for six years and 156 episodes 1950–1956. He and Carrillo first crossed professional paths in the 1935 film Moonlight Murder. Prior to his television success, Renaldo appeared in 67 feature-length films beginning in the silent era. Metro-Goldwyn-Mayer hired him in 1929 for a silent version of The Bridge of San Luis Rey. Paramount Pictures cast him in five films, including the acclaimed Two Years Before the Mast and For Whom the Bell Tolls.