Jämtland County (Jämtlands län) is a county or län in the middle of Sweden consisting of the provinces of Jämtland and Härjedalen, along with minor parts of Hälsingland and Ångermanland, plus two small uninhabited strips of Lapland and Dalarna. Jämtland County constitutes 12 percent of Sweden's total area, 49,443 km² (19,090 sq mi) and is the third largest county in the country. The county capital is Östersund and the county governor, appointed by the Swedish government, is Britt Bohlin Olsson, who leads the administrative board. Jämtland County borders the counties of Dalarna, Gävleborg, Västernorrland, and Västerbotten. It also shares a border with the Norwegian counties of Nord-Trøndelag and Sør-Trøndelag.

The county was established in 1810 and its foundation has both domestic and foreign causes. Upon formation it only consisted of the provinces of Jämtland and Härjedalen, which is why the coat of arms is a shield parted per fess with their provincial arms.

Jämtland County consists of primarily the provinces of Jämtland and Härjedalen, though minor parts of Hälsingland and Ångermanland are also included, along with small uninhabited areas in Lapland and Dalarna.

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