| Cailhau | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Cailhau (11).svg |
| Arrondissement: | Limoux |
| Canton: | La Piège au Razès |
| Insee: | 11058 |
| Postal Code: | 11240 |
| Mayor: | Bernard Ragnère[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.1478°N 2.1372°W |
| Elevation M: | 221 |
| Elevation Min M: | 195 |
| Elevation Max M: | 346 |
| Area Km2: | 9.76 |
Cailhau (in French kajo/; Occitan (post 1500);: Calhau) is a commune in the Aude department in southern France.