Donald Jay Irwin was a Democratic member of the U.S. House of Representatives from Connecticut's 4th district, Connecticut State Treasurer and mayor of Norwalk, Connecticut.

Connecticut's 4th congressional district is a congressional district in the U.S. state of Connecticut. Located in the southwestern part of the state, the district is largely suburban and extends from Bridgeport, the largest city in the state, to Greenwich – an area largely coextensive with the Connecticut side of the New York metropolitan area. The district also extends inland, toward Danbury and toward the Lower Naugatuck Valley.