Elzéar-Henri Juchereau Duchesnay (July 19, 1809 – May 12, 1871) was a seigneur, lawyer and political figure in Canada East.

He was also interested in farming and was president of the county agricultural society.

He was elected to the Legislative Council of the Province of Canada in 1856 for the Lauzon division and served until Confederation, when he was appointed to the Canadian Senate.

One of his sons, Charles-Edmond, became superintendent of the Canadian Pacific Railway in British Columbia.

He was the grandfather of François-Xavier Chouinard, clerck of the Ville de Québec until 1961.