Michael Constantine (born May 22, 1927) is an American actor of Greek descent.
He is probably now best known for his portrayal of Kostas "Gus" Portokalos, the Windex bottle-toting Greek father of Toula Portokalos (Nia Vardalos), in the 2002 surprise hit film My Big Fat Greek Wedding. Prior to that, he was well known for his extensive television work, especially as the long-suffering high school principal, Seymour Kaufman, on ABC's sitcom, Room 222, for which he won an Emmy Award as Best Supporting Actor in 1970. He played a night court magistrate, Matthew J. Sirota, on the brief 1976 sitcom, Sirota's Court.