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.

2000 Canadian federal election: Madawaska—Restigouche
Party Candidate Votes % ±%
Liberal Jeannot Castonguay 19,913 52.27 +15.29
Progressive Conservative Jean F. Dubé 14,417 37.84 -12.46
Alliance Scott Chedore 1,958 5.14
New Democratic Claude Albert 1,811 4.75 -5.66
Total valid votes 38,099 100.00

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