Kalhovdfjorden is a lake in Tinn Municipality in Telemark county, Norway.

The lake lies about 20 kilometres (12 mi) to the north of the town of Rjukan and about 15 kilometres (9.3 mi) east of the Hardangervidda National Park.

The river Mår is the main outflow of the lake.

The area of the lake is 20.39 square kilometers (7.87 sq mi) and it is located 1,084 meters (3,556 ft) above sea level.

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