Mattawan is a municipality in the Canadian province of Ontario.

Located in the Nipissing District, the municipality had a population of 161 in the Canada 2016 Census.

Its main access road is Highway 533, with Highway 656 as a short branch leading to the Otto Holden Generating Station on the Ottawa River.

In 2007, Mattawan, along with the town of Mattawa and the townships of Papineau-Cameron, Bonfield and Calvin cooperated to create a newly branded Mattawa Voyageur Country tourist region in order to promote the area.

This Northern Ontario geographical article is a stub.