| Hájek | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Karlovy Vary |
| Subdivision Type2: | District |
| Subdivision Name2: | Karlovy Vary |
| Pushpin Map: | Czech Republic |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location in the Czech Republic |
| Coordinates: | 50.2833°N 12.9197°W |
| Established Title: | First mentioned |
| Established Date: | 1409 |
| Area Total Km2: | 8.75 |
| Elevation M: | 473 |
| Population As Of: | 2024-01-01 |
| Population Footnotes: | [1] |
| Population Total: | 643 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 363 01 |
Hájek (German: Grasengrün) is a municipality and village in Karlovy Vary District in the Karlovy Vary Region of the Czech Republic. It has about 600 inhabitants.
The village of Nová Víska is an administrative part of Hájek.