Skien [²ʃeːən] is a town and municipality (54,589 inhabitants end 2017), seat of the Telemark county, Norway. It is part of the traditional region of Grenland.
Skien is one of Norway's oldest cities, with an urban history dating back to the Middle Ages, and received privileges as a market town in 1358. From the 15th century, the city was governed by a 12-member council. The modern municipality of Skien was established on 1 January 1838. The rural municipalities of Gjerpen and Solum were merged into the municipality of Skien on 1 January 1964.