Hřensko (German: Herrnskretschen) is a municipality and village in Děčín District in the Ústí nad Labem Region of the Czech Republic.

Hřensko consists of two municipal parts (in brackets population according to the 2021 census):[2] Before the establishment of the village, there was a pub under the Hornichen mountain called Horniss Kraczmer.

The possessive adjective gradually distorted (Hörniß-, Herniß-, Herns-) and was then adopted into Czech as Hřen- with the suffix of place names -sko.

In the municipal territory is located the lowest point of the Czech Republic, which is the Elbe on the border with Germany at 115 m (377 ft) above sea level.

The main attractions in the municipal territory are the Kamenice Gorge and Pravčická brána, the largest natural stone bridge in Europe.