L'Assomption is a provincial electoral district in the Lanaudière region of Quebec, Canada, that elects members to the National Assembly of Quebec. It includes the city of L'Assomption and part of the city of Repentigny, as well as a few other municipalities. It was created for the 1867 election (and an electoral district of that name existed earlier in the Legislative Assembly of the Province of Canada and the Legislative Assembly of Lower Canada). In the change from the 2011 to 2017 electoral map, it lost all of its territory in Terrebone to the riding of Masson.