Mark Irwin (born August 7, 1950) is a Canadian cinematographer. Born in Toronto, Ontario, he studied political science at the University of Waterloo and Filmmaking at York University. He is best known for his collaborations with David Cronenberg (Fast Company, Scanners, Videodrome, The Dead Zone, and The Fly), Wes Craven (Scream and New Nightmare), and the Farrelly brothers (There's Something About Mary, Dumb and Dumber, and Me, Myself & Irene).