| Mattawan | |
| Official Name: | Municipality of Mattawan |
| Settlement Type: | Municipality (single-tier) |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 220 |
| Pushpin Label: | Mattawan |
| Pushpin Label Position: | top |
| Coordinates: | 46.3333°N -128°W |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ontario |
| Subdivision Type2: | District |
| Subdivision Name2: | Nipissing |
| Leader Title: | Mayor |
| Leader Name: | Peter Murphy |
| Area Land Km2: | 201.00 |
| Population As Of: | 2016 |
| Population Footnotes: | [1] |
| Population Total: | 161 |
| Population Density Km2: | 0.8 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Postal Code Type: | Postal code |
| Postal Code: | P0H 1V0 |
| Area Code: | 705, 249 |
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.
The municipality has no named communities within its boundaries; all addresses within the municipality are rural routes assigned to the neighbouring town of Mattawa.
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.[2]
In the 2021 Census of Population conducted by Statistics Canada, Mattawan had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of 200.12km2, it had a population density of in 2021.[3]