Skien is a municipality in Telemark county, Norway. It is located in the traditional district of Grenland, although historically it belonged to Grenmar/Skiensfjorden, while Grenland referred the Norsjø area and Bø. The administrative centre of the municipality is the city of Skien, which is also the administrative centre of the whole county. Some of the notable villages in the municipality include Åfoss, Hoppestad, Klovholt, Luksefjell, Melum, Kilebygda, Skotfoss, Sneltvedt, and Valebø.

Holla is a former municipality in Telemark county, Norway. The 252-square-kilometre (97 sq mi) municipality existed from 1838 until its dissolution in 1964. The area is now part of Nome Municipality. The administrative centre was the village of Ulefoss. The municipality was considered part of the traditional district of Grenland, but in 1964 it became been part of the new Nome municipality which has been considered to be part of the Midt-Telemark district.