Český Jiřetín (German: Georgendorf) is a municipality and village in Most District in the Ústí nad Labem Region of the Czech Republic.

In the municipal territory is Fláje Reservoir, built in 1963 as a water source and flood protection.

The dam is a concrete, pillar type (hollow inside), the only one of its kind in the country.

It is one of the oldest and most valuable wooden sacred buildings in the country.

Originally built in Fláje, it was moved to Český Jiřetín in 1969, and the church was thus saved from being flooded by the reservoir.