| Calvin | |
| Official Name: | Township of Calvin |
| Settlement Type: | Township (single-tier) |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 46.2333°N -134°W |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ontario |
| Subdivision Type2: | District |
| Subdivision Name2: | Nipissing |
| Leader Title: | Mayor |
| Leader Name: | Richard Gould |
| Area Total Km2: | 140.98 |
| Population As Of: | 2016 |
| Population Footnotes: | [1] |
| Population Total: | 516 |
| Population Density Km2: | 3.7 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Postal Code Type: | Postal code |
| Postal Code: | P0H 1V0 |
| Area Code: | 705 |
Calvin is a township in northeastern Ontario, Canada on the Mattawa River in Nipissing District. The township took its name from Delino Dexter Calvin, an Ontario lumber merchant and MPP based in Frontenac County.
In 2007, Calvin, along with the town of Mattawa and the townships of Papineau-Cameron, Mattawan and Bonfield cooperated to create a newly branded Mattawa Voyageur Country tourist region in order to promote the area.[2]
The township comprises the communities of Eau Claire and Eau Claire Station.
In the 2021 Census of Population conducted by Statistics Canada, Calvin had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of 140.13km2, it had a population density of in 2021.[3]