| Castillon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Castillon (65).svg |
| Arrondissement: | Bagnères-de-Bigorre |
| Canton: | La Vallée de l'Arros et des Baïses |
| Insee: | 65135 |
| Postal Code: | 65130 |
| Mayor: | Jean-Marie Vignes[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Plateau de Lannemezan |
| Coordinates: | 43.0892°N 0.2153°W |
| Elevation M: | 565 |
| Elevation Min M: | 334 |
| Elevation Max M: | 585 |
| Area Km2: | 3.32 |
Castillon (in French pronounced as /kastijɔ̃/; Occitan (post 1500);: Castilhon) is a commune in the Hautes-Pyrénées department in south-western France.