William Dennis Gargan (July 17, 1905 – February 17, 1979) was an American film, television and radio actor. He was the 5th recipient of the Screen Actors Guild Lifetime Achievement Award in 1967, and in 1941, was nominated for the Academy Award for Best Supporting Actor for his role as Joe in They Knew What They Wanted. He acted in decades of movies including parts in Follow the Leader, Rain, Night Flight, Three Sons, Isle of Destiny and many others. The role he was best known for was that of a private detective Martin Kane in the 1949–1952 radio-television series Martin Kane, Private Eye. In television, he was also in 39 episodes of The New Adventures of Martin Kane.