Rennebu 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 Berkåk, located along European route E6. The majority of the population lives in Berkåk, Innset, Stamnan, Ulsberg, Voll, and Nerskogen.
The municipality of Rennebu was established in 1839 when it was separated from Meldal. Initially, the population was 2,368. On 1 January 1966, the parish of Innset (population: 420) was transferred from Kvikne (and also from Hedmark county) to Rennebu (and Sør-Trøndelag county). Then on 1 January 1970, the Garlia area (population: 5) was transferred from Tynset (and Hedmark county) to Rennebu (and Sør-Trøndelag).