Mathon (Romansh: Maton) is a former municipality in the Viamala Region in the Swiss canton of Graubünden.

Of the rest of the land, 1.4% is settled (buildings or roads) and the remainder (22.3%) is non-productive (rivers, glaciers or mountains).

[5] Before 2017, the former municipality was located in the Schams sub-district, of the Hinterrhein district, after 2017 it was part of the Viamala Region.

[8] In the 2007 federal election the most popular party was the SVP which received 66.9% of the vote.

Although 87% of the population understands Romansch, German is now the sole official language.