Marcel Lessard, PC (August 14, 1926 – November 19, 2023) was a Canadian politician.

Lessard was first elected to the House of Commons of Canada as the Social Credit Member of Parliament (MP) for Lac-Saint-Jean, Quebec as part of Réal Caouette's breakthrough in the province in the 1962 election.

The Social Credit Party split soon after along English and French lines, however, Lessard declined to join the majority of Social Credit's Quebec MPs who followed Caouette into the Ralliement Créditiste and remained with the Alberta-based Social Credit Party led by Robert Thompson for the rest of the parliamentary term.

Lessard retained his seat, and joined the Liberals on the Opposition benches.

Lessard died at Hôpital Saint-François d'Assise in Quebec City on November 19, 2023, at the age of 97.