Wägitalersee is a reservoir lake in the municipality of Innerthal in the canton of Schwyz, Switzerland.

Its outflow is the Wägitaler Aa, which drains into Upper Lake Zurich at Lachen.

It is surrounded by the mountains Gross Aubrig, Fluebrig, Zindlenspitz, Brünnelistock and Bockmattli.

The primary economical purpose of the Wägitalersee is to serve as reservoir for pumped-storage hydroelectricity.

[1] Besides the above industrial purpose, the lake is very popular as a (nearby) recreational area for families, hikers, nature lovers and especially fishermen.