| Castelgaillard | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Gaudens |
| Canton: | Cazères |
| Insee: | 31115 |
| Postal Code: | 31230 |
| Mayor: | Robert Duclos[1] |
| Term: | 2022 - 2026 |
| Coordinates: | 43.3553°N 0.9017°W |
| Elevation M: | 330 |
| Elevation Min M: | 206 |
| Elevation Max M: | 351 |
| Area Km2: | 6.82 |
Castelgaillard (pronounced as /fr/; oc|Castèthgalhard) is a commune in the Haute-Garonne department in southwestern France.