Orkdal is a municipality in Sør-Trøndelag county, Norway. It is part of the Orkdalen region. The administrative centre of the municipality is the village of Orkanger. Other villages in the municipality include Kjøra, Geitastrand, Gjølme, Thamshavn, Fannrem, Vormstad, Svorkmo, and Hoston.
Agriculture plays a significant role in the municipality. The Thamshavnbanen was used to transport ore from Løkken Verk to the port of Thamshavn, and is now a vintage railway. The Fannrem concentration camp was located in Fannrem during World War II.
Orkdal was established as a municipality on 1 January 1838 (see formannskapsdistrikt). On 1 July 1920, the port of Orkanger (population: 1,715) and the southern district of Orkland (population: 1,760) were separated from Orkdal to form separate municipalities. On 1 January 1963, the municipalities of Orkanger, Orkland, and Geitastrand were merged together with Orkdal to form a new, larger municipality of Orkdal.