Masson is a provincial electoral district in Quebec, Canada that elects members to the National Assembly of Quebec. It includes portions of the city of Mascouche and part of the city of Terrebonne (corresponding to the former city of La Plaine). It was created for the 1989 election from parts of the Terrebonne and L'Assomption electoral districts. In the change from the 2001 to the 2011 electoral map, it lost Charlemagne and the part of Repentigny it formerly had to the L'Assomption electoral district.