Nesjøen is an artificial lake (reservoir) in the municipality of Tydal in Trøndelag county, Norway. The lake is part of the Nea-Nidelv watershed which lies on the western part of the Sylan mountain range. The lake lies about 10 kilometres (6.2 mi) southeast of the municipal center of Ås and 6.5 kilometres (4.0 mi) north of the village of Stugudalen. The lake is good for trout fishing.