Eidangerfjord is a fjord located in Porsgrunn municipality in Telemark county, Norway. It is 6 km long, and stretches between Brevik and the island village of Sandøya. The largest island located in the fjord is Kattøya, located at the head of Eidangerfjord.The shipping harbor for the cement produced by Norcem is located at Brevik. Further in, on the west shore, lies the village of Heistad. Stathelle, with a population of about 8,000, is situated at the junction of the Langesundsfjord and Frierfjord with Eidangerfjord.