Røros landsogn (English: Røros rural parish) is a former municipality in the old Sør-Trøndelag county in Norway. The 729-square-kilometre (281 sq mi) municipality encompassed the southern part of the what is now the municipality of Røros in Trøndelag county. The municipality nearly surrounded the small enclave that was the mining town of Røros and it stretched all the way southeast to the lake Femunden and the Swedish border. The administrative centre of the municipality was located in the town of Røros where Røros Church is located.