Tufsingdalen[2] or Tufsingdal is a village area and valley in Os Municipality in Innlandet county, Norway.

The village area is located along the river Tufsinga which flows through the Tufsingdalen valley.

In 1712, ore explorers from Røros Kobberverk found silver in the rock on the west side of Tufsingdalen, and a trial operation was started the following year.

In 1739, Femundshytta was built in Tufsingdalen as a smelting hut for the copper that was mined in and around Røros.

In July 2010, the area was included on the UNESCO World Heritage List as part of the entry Røros Mining Town and the Circumference.