Blatno (German: Platten) is a municipality and village in Chomutov District in the Ústí nad Labem Region of the Czech Republic. It has about 600 inhabitants. Blatno lies approximately 6 kilometres (4 mi) north-west of Chomutov, 52 km (32 mi) west of Ústí nad Labem, and 90 km (56 mi) north-west of Prague. The Bílina River originates in the municipal territory.