Mercier is a provincial electoral district in the Montreal region of Quebec, Canada that elects members to the National Assembly of Quebec. It consists of part of the Le Plateau-Mont-Royal borough of the city of Montreal. It was created for the 1966 election from parts of Montréal-Mercier and Montréal–Saint-Louis electoral districts. In the change from the 2001 to the 2011 electoral map, its territory was unchanged. In the change from the 2011 to the 2017 electoral map, the riding gained the remainder of the Mile End neighbourhood from Outremont.