There are several municipalities and communities have the name Langnau in Switzerland:
- Langnau am Albis, in the canton of Zürich
- Langnau-Gattikon railway station in Langnau am Albis
- Langnau bei Reiden, in the canton of Lucerne
- Langnau im Emmental, in the canton of Bern
- Langnau i.E. railway station in Langnau im Emmental
- Langnau bei Märwil, in Affeltrangen municipality, canton of Thurgau