Frank Costanza (played by Jerry Stiller) is a fictional character on the US television sitcom Seinfeld (1989-1998). He is the father of George Costanza and is married to Estelle Costanza .

Though currently retired, we learn in "The Understudy" that he once worked as a salesman, selling religious artifacts.

Frank is an exceptionally good cook (he spent time as an army cook in Korea), as long as he can overcome his fears of accidentally poisoning people with his cooking. Hobbies include listening to Latin music on vinyl records and collecting TV Guide. He invented an alternative-holiday known as Festivus and was co-creator of the "Bro" (or was it the "mansierre" ?)with Cosmo Kramer.