Sørli is a former municipality in the old Nord-Trøndelag county in Norway. The 1,435-square-kilometre (554 sq mi) municipality existed from 1915 until its dissolution in 1964. The municipality encompassed the southern part of what is now the municipality of Lierne in Trøndelag county. The administrative centre of the municipality was the village of Mebygda where Sørli Church is located.