Notodden  is a city and municipality in Telemark county, Norway. It is part of the traditional region of Øst-Telemark. The administrative centre of the municipality is the city of Notodden.

Notodden was separated from the municipality of Heddal in 1913 to become a separate city and municipality. On 1 January 1964, the rural municipalities of Heddal and Gransherad were merged into Notodden to form a new enlarged municipality.