| Blajan | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Blajan (Haute-Garonne).svg |
| Arrondissement: | Saint-Gaudens |
| Canton: | Saint-Gaudens |
| Insee: | 31070 |
| Postal Code: | 31350 |
| Mayor: | Jean-Bernard Castex[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.2611°N 0.6447°W |
| Elevation M: | 360 |
| Elevation Min M: | 277 |
| Elevation Max M: | 430 |
| Area Km2: | 12.68 |
Blajan (in French pronounced as /blaʒɑ̃/) is a commune in the Haute-Garonne department in southwestern France.
The river Gesse forms most of the commune's northwestern border.