Straumsfjorden or Straumfjorden is a lake that is located along the border of the municipalities of Bygland and Valle in Agder county, Norway. The lake has a dam on the south end which discharges into the Hjellevatn lake and eventually travels to the lake Topsæ and the Tovdalselva river drainage basin. The lake sits in the southeastern part of the municipality, about 11 km southeast of the village of Rysstad and about 10 km northeast of Besteland. Artifacts dating back to the Iron Age have been found along the lake.