Topdalsfjorden or Tofdalsfjorden is a fjord in the municipality of Kristiansand in Agder county, Norway.

The 12-kilometre (7.5 mi) long fjord runs from the village of Ålefjær south to the city centre of Kristiansand.

The river Topdalselva empties into the fjord at the eastern side just south of the Kristiansand Airport, Kjevik.

The European route E18 highway crosses the fjord on the Varodd Bridge.

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