Neadalen[1] is a river valley in Trøndelag county, Norway.

The 50-kilometre (31 mi) long valley generally runs east to west through Tydal Municipality and Selbu Municipality.

The valley begins at the large lake Nesjøen and it follows the Nea River to the west and it ends at the large lake Selbusjøen.

Norwegian County Road 705 follows the river through the majority of the valley.

The river Tya flows through the Tydalen valley and empties into the Nea River at the village of Ås.