Strømsfoss is a village in Aremark Municipality, in Østfold, Norway. Strømsfoss lies at 114 m above sea level. The nearest city is Halden, 25 km to the southwest. Among the landmarks around are Fredriksten (25 km), Aremark Church (6.4 km) and Rød herregård (26 km). Among the natural features are Sarp Falls (30 km) and Galteryggen (7.6 km).