The town of Bad Laasphe lies in the upper Lahn Valley, near the stately home of Wittgenstein Castle in the former Wittgenstein district. The municipal area is located south of the main crest of the Rothaargebirge, and borders in the north on the towns of Bad Berleburg and Erndtebrück, in the east on the town of Biedenkopf in Hessen, in the southeast on Breidenbach, in the south on Dietzhölztal and in the west on the town of Netphen. Bad Laasphe lies about 30 km east of Siegen and 25 km northwest of Marburg.
The highest elevation in the municipal area rises to 694 m. It lies southwest of the main town at the outlying centre of Heiligenborn.
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