Lac-Ashuapmushuan is an unorganized territory in the Canadian province of Quebec, Canada, located in the regional county municipality of Le Domaine-du-Roy. The region had a population of 41 as of the 2021 Canadian census, and covered a land area of 14,684.28 square kilometres (5,669.63 sq mi). It is home to the Ashuapmushuan Wildlife Reserve.