Oeschinen Lake, Alpine lake in Bernese Oberland, Switzerland

Oeschinen Lake is an Alpine lake in the Bernese Alps, surrounded by steep rock walls and green meadows. The water sits at about 1,600 meters (5,250 feet) elevation and is framed by untouched mountainous terrain.

The area gained recognition in 2007 as part of the Jungfrau-Aletsch-Bietschhorn UNESCO World Heritage site due to its geological and natural features. This designation protects the mountain landscape and highlights its scientific importance.

The name Öschibach, used for the outflow stream, keeps the local «Ö» spelling on Swiss national maps rather than the «Oe» of Oeschinensee. The stream leaves the lake underground through the natural dam and reappears shortly after, then supplies Kandersteg's drinking water and a power station before joining the Kander. Two hotels with restaurants, several barbecue sites and a rowing-boat rental stand at the shore.

A gondola lift runs from Kandersteg to the top station, from which the shore is about 25 minutes on foot along a gently descending path; an electric vehicle covers the same stretch in summer. The south shore and the lake circuit have been closed since 2019–2020 because of rockfall danger from the Spitzen Stein, and trails can also close after heavy rain. The valley station is linked to Kandersteg railway station by bus.

The lake is usually frozen for five months, from December to May, and ice fishing for Arctic char, lake trout and rainbow trout is popular from January to March. In December 2015 it opened for ice skating for the first time in 19 years after an unusually thin snow cover.