Selbu is a municipality in Sør-Trøndelag county, Norway. The administrative centre of the municipality is the village of Mebonden. Other villages in Selbu include Flora, Fossan, Hyttbakken, Innbygda, Selbustrand, Tømra, and Vikvarvet.
The municipality (originally the parish) of Selbu was established on 1 January 1838 (see formannskapsdistrikt). On 1 January 1901, the eastern part of the municipality was separated to form the new municipality of Tydal. This left Selbu with 4,607 inhabitants. The borders of Selbu have not changed since then.
The Old Norse form of the name was Selabú. The first element is the genitive case of the old name of the lake Selbusjøen (Old Norse: Seli). The last element is bú which means "district".