is a town in Telemark, Norway, with an estimated population of 2,700. Brevik was established as a municipality 1 January 1838 (see formannskapsdistrikt), but was merged with Porsgrunn on 1 January 1964. Brevik is regarded one of the best preserved towns from the sailing ship era. The town is located on the far end of Eidanger peninsula, and was a former export centre for ice and timber. The last shipment of wood to the United Kingdom was around 1960.
Brevik is Cort Adeler's birth town.