Åfoss is a village in Skien Municipality in Telemark county, Norway. The village is located near the outlet of the lake Norsjø, just across the river from the village of Skotfoss. The village is located about 5 kilometres (3.1 mi) to the west of the town of Skien and about 2 kilometres (1.2 mi) to the north of the village of Klovholt.