Topdalsfjorden is a fjord in the municipality of Kristiansand in Vest-Agder, Norway. The river Topdalselva mouths into the fjord at the eastern side. The fjord is crossed by the Varodd Bridge.
Coordinates: 58°10′26″N 8°03′32″E / 58.174°N 8.059°E / 58.174; 8.059