| Castelreng | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Castelreng (Aude).svg |
| Arrondissement: | Limoux |
| Canton: | La Région Limouxine |
| Insee: | 11078 |
| Postal Code: | 11300 |
| Mayor: | Hervé Garcia[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.0292°N 2.1383°W |
| Elevation Min M: | 244 |
| Elevation Max M: | 572 |
| Area Km2: | 11.02 |
Castelreng is a commune in the department in the Aude department in the Occitanie region in southern France.
Its inhabitants are known as Castelrengois.