Kragerø is a municipality in Telemark county, Norway. It is located in the traditional districts of Grenland and the smaller Vestmar. The administrative centre of the municipality is the town of Kragerø. Villages in Kragerø include Helle, Vadfoss, Kil, and Portør.

Telemark is a county and a current electoral district in Norway. Telemark borders the counties of Vestfold, Buskerud, Vestland, Rogaland and Agder. In 2020, Telemark merged with the county of Vestfold to form the county of Vestfold og Telemark. On 1 January 2024, the county of Telemark was re-established after Vestfold og Telemark was divided again.