Innsvatnet is a lake in the municipality of Verdal in Nord-Trøndelag county, Norway. The lake lies in the eastern part of the municipality, just west of the border with Sweden. The lake is the headwaters for the river Inna, which later flows into the Verdalselva river. The 3.9-square-kilometre (1.5 sq mi) lake sits at an elevation of 415 metres (1,362 ft) above sea level.