| Petrohrad | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Ústí nad Labem |
| Subdivision Type2: | District |
| Subdivision Name2: | Louny |
| Pushpin Map: | Czech Republic |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location in the Czech Republic |
| Coordinates: | 50.1275°N 13.4464°W |
| Established Title: | First mentioned |
| Established Date: | 1360 |
| Area Total Km2: | 18.50 |
| Elevation M: | 365 |
| Population As Of: | 2024-01-01 |
| Population Footnotes: | [1] |
| Population Total: | 627 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal codes |
| Postal Code: | 439 85, 441 01 |
Petrohrad (German: Petersburg) is a municipality and village in Louny District in the Ústí nad Labem Region of the Czech Republic. It has about 600 inhabitants.
Petrohrad lies approximately 36km (22miles) south-west of Louny, 73km (45miles) south-west of Ústí nad Labem, and 71km (44miles) west of Prague.
The villages of Bílenec and Černčice are administrative parts of Petrohrad.