Petrohrad () is a municipality and village in Louny District in the ÃÂstÃÂ nad Labem Region of the Czech Republic. It has about 600 inhabitants.
Petrohrad lies approximately south-west of Louny, south-west of ÃÂstÃÂ nad Labem, and west of Prague.
Petrohrad consists of three municipal parts (in brackets population according to the 2021 census):