Masson is a provincial electoral district in Quebec, Canada, that elects members to the National Assembly. It includes portions of the city of Mascouche and the La Plaine sector of the city of Terrebonne. 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.