| Official Name: | Kjøpmannskjær |
| Settlement Type: | Village |
| Pushpin Map: | Norway Vestfold#Norway |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location of the village |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Eastern Norway |
| Subdivision Name2: | Vestfold |
| Subdivision Type3: | District |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Færder Municipality |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Area Total Km2: | 0.46 |
| Population As Of: | 2022 |
| Population Total: | 440 |
| Population Density Km2: | 953 |
| Postal Code Type: | Post Code |
| Postal Code: | 3143 Kjøpmannskjær |
| Coordinates: | 59.1729°N 10.3833°W |
| Elevation M: | 2 |
| Elevation Footnotes: | [1] |
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 0.46km2 village has a population (2023) of 440 and a population density of .[2]