Dalarna County (Dalarnas län) is a county or län in middle Sweden. It borders the counties of Jämtland, Gävleborg, Västmanland, Örebro and Värmland. It is also bordered by the Norwegian counties of Hedmark and Sør-Trøndelag in the west. The capital is Falun.
The term Dalarna County is mainly used for administrative purposes, being further subdivided into municipalities (kommuner). Dalarna County virtually encompasses the historical province Dalarna (literally, "the valleys"), that deals with history and culture of the area.