Jeannot Castonguay (born 1 September 1944) was a Liberal member of the House of Commons of Canada from 2000 to 2004.
He won the Madawaska—Restigouche electoral district in New Brunswick to become a member of the 37th Canadian Parliament.
Born in Saint-Quentin, New Brunswick, Castonguay, is a career physician.
Castonguay left political life in 2004 as he did not seek re-election.
Jean-Claude D'Amours won the Madawaska-Restigouche riding for the Liberal party that year.