Léonce Mercier

Léonce Mercier (August 11, 1926 – December 27, 2019) was a Canadian Senator from Quebec as well as a businessman and consultant.

Mercier is a long-time activist and organizer in the Liberal Party of Canada in Quebec under Pierre Trudeau and Jean Chrétien and Quebec Liberal Party during the leadership of Jean Lesage and Robert Bourassa. He began his involvement in northern Quebec in the Saguenay–Lac-Saint-Jean region.

In 1995, he was in charge of the Action Canada national unity campaign in the region during the 1995 Quebec referendum and was also an organizer for the "No" side during the 1980 Quebec referendum.

In his earlier life he worked variously as a car salesman in a Ford dealership, an inspector for a lumber company, an agent for independent truckers. In the 1980s he was a business and public relations consultant.