Loučná pod Klínovcem (until 1947 Český Wiesenthal; German: Böhmisch Wiesenthal) is a town in Chomutov District in the Ústí nad Labem Region of the Czech Republic.

Loučná pod Klínovcem consists of two municipal parts (in brackets population according to the 2021 census):[2] Loučná pod Klínovcem is located about 30 kilometres (19 mi) west of Chomutov and 21 km (13 mi) north of Karlovy Vary.

The highest point of the municipal territory and of the entire Ústí nad Labem Region is a contour line below the top of the Klínovec Mountain at 1,231 m (4,039 ft) above sea level.

The first written mention of Loučná pod Klínovcem is from 1431, under its German name Wiesenthal.

At the beginning of the 16th century, mining developed in the area, Český Wiesenthal was resettled and its importance began to grow.