is a town and municipality in Telemark county Norway. It is part of the traditional region of Øst-Telemark. The administrative centre of the municipality is the town of Notodden. Notodden was separated from the municipality of Heddal in 1913 to become a separate town and municipality. On 1 January 1964 the rural municipalities of Heddal and Gransherad were merged into Notodden to form a new enlarged municipality.
