Pat Marcy (September 6, 1913 – March 13, 1993) was an Italian-American political boss who wielded enormous power over the Illinois Democratic Party during much of the 20th century. According to Federal prosecutors, as well as informants Robert Cooley and Michael J. Corbitt, he was also a trusted and valued associate of the Chicago Outfit and the American Mafia. His official title was, "Secretary of the First Ward." FBI agent William Roemer, testifying before the U.S. Senate in 1983, said he believed Marcy to be a made man in the Chicago Outfit.