The Bietschhorn (3,934 m) is a mountain in canton Wallis to the south of the Bernese Alps in Switzerland. The northeast and southern slopes of the mountain are part of the Jungfrau-Aletsch Protected Area (formerly Jungfrau-Aletsch-Bietschhorn) listed as a UNESCO World Heritage Site that also includes the Jungfrau and the Aletsch Glacier.