| Official Name: | Bäk |
| Pushpin Map: | Afghanistan |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Afghanistan |
| Subdivision Type: | Country |
| Subdivision Name: |  Afghanistan |
| Subdivision Type1: | Province |
| Subdivision Name1: | Khost Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Bak District |
| Unit Pref: | Imperial |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 33.5°N 73°W |
| Elevation M: | 1137 |
Bäk[1] is a village in Khost Province, Afghanistan and the center of the boundary Bak District, close to the border with Pakistan. It is located on 33.5°N 70.05°W at 1137 m altitude.