Orville O. Dull (April 25, 1888 – December 29, 1978) was an American producer, director, production manager and assistant director. He was best known for his films produced for Metro-Goldwyn-Mayer. Dull was nominated during the 6th Academy Awards for the short lived Best Assistant Director category. He won the Oscar for Best Documentary Feature in the 1948 Oscars for the film "The Secret Land". He worked on over 40 films from 1925 to 1951.