Tufsingdalen 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. It lies in the southeastern part of the municipality, about 40 kilometres (25 mi) southeast of the village of Os i Østerdalen and about 10 kilometres (6.2 mi) north of the large lake Femunden.