Kjøpmannskjær is a village in Færder Municipality in Vestfold county, Norway. The village is located on the southern shore of the island of Nøtterøy, about east of the village of Tenvik, about north of the village of Sundene (on Tjøme island), and about south of the village of Skjerve. The village of Strengsdal lies about to the east along the southern shore of the island.
The village has a population (2023) of 440 and a population density of .
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