Bad Laasphe (German: [baːt ˈlaːsfə] ⓘ) is a town in North Rhine-Westphalia, Germany, in the Siegen-Wittgenstein district.

The highest elevation in the municipal area rises to 694 m. It lies southwest of the main town at the outlying centre of Heiligenborn.

Each one of the following centres is part of the town of Bad Laasphe: In 1888, the town of Laasphe lay in the Prussian administrative region of Arnsberg in Wittgenstein district and was connected to the Kreuzthal-Marburg line of the Prussian State Railway (Preußische Staatsbahn).

On 1 January 1984 the town became a Kneipp curative spa for its mild climate, and since then has been called Bad Laasphe.

The inescutcheon (smaller shield within the main one) bears the same arms as the town's former overlords, the Counts of Wittgenstein.