Glåmos is a former municipality in the old Sør-Trøndelag county in Norway. The 239-square-kilometre (92 sq mi) municipality existed from 1926 until its dissolution in 1964. It was located in the northern part of what is now Røros Municipality in Trøndelag county. It included all the area around the headwaters of the river Glåma and the areas surrounding the northern and western sides of the lake Aursunden. The administrative centre was the village of Glåmos where Glåmos Church is located.