Jean-Baptiste Couillard Dupuis (August 24, 1814 – August 13, 1889) was a farmer, merchant and political figure in Quebec.
He represented L'Islet in the Legislative Assembly of Quebec from 1878 to 1881 as a Liberal.
His surname was "Couillard Dupuis".
He was born in Montmagny, Lower Canada, the son of Charlemagne Couillard Dupuis and Charlotte Boilard, and lived at Saint-Roch-des-Aulnaies.
In 1837, he married Justine Letellier, the sister of Luc Letellier de St-Just.
Couillard Dupuis was defeated when he ran for reelection in 1881.