Trøa is a village in Selbu Municipality in Trøndelag county, Norway. It is located along the eastern end of the lake Selbusjøen, just north of the village of Innbygda, about 5 kilometres (3.1 mi) north of the municipal center of Mebonden, and about 4 kilometres (2.5 mi) south of the village of Tømra.

The 0.23-square-kilometre (57-acre) village has a population (2024) of 234 and a population density of 1,017 inhabitants per square kilometre (2,630/sq mi).