Konstantinovy Lázně (German: Konstantinsbad) is a spa municipality and village in Tachov District in the Plzeň Region of the Czech Republic.

Konstantinovy Lázně consists of eight municipal parts (in brackets population according to the 2021 census):[2] Konstantinovy Lázně is located about 26 kilometres (16 mi) northeast of Tachov and 32 km (20 mi) northwest of Plzeň.

The highest point is the hill Hradišťský kopec at 632 m (2,073 ft) above sea level.

Konstantinovy Lázně was established in 1803, when the spa was built, and is the youngest village in the region.

The Konstantinovy Lázně spring has the highest content of free carbon dioxide in the Czech Republic.

[10] The ruins of the Gutštejn Castle are located in the southern part of the municipal territory.