Wilderswil is a village and a municipality in the Interlaken -Oberhasli administrative district in the Canton of Bern in Switzerland .

Wilderswil belongs to the Small Agglomeration Interlaken with 23,300 inhabitants (2014).

The village of Wilderswil is situated at the southern border of the Bödeli, the tongue of land between Lake Thun and Lake Brienz in the Bernese Oberland region. It lies at the entrance to the mountain valleys containing the Lütschine river and its tributary the Saxetenbach, and is some 4 km (2.5 mi) south of Interlaken, the main town of the Bödeli.

The municipality extends for some 8 km (5.0 mi) from the village, along the west bank of the Lütschine river, and includes the flanks of the mountains that border that valley to the west. Its altitude ranges from some 580 m (1,900 ft), on the Bödeli plain, to 2,413 m (7,917 ft), at the summit of Sulegg.