| Gaillagos | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Gaillagos (65).svg |
| Arrondissement: | Argelès-Gazost |
| Canton: | La Vallée des Gaves |
| Insee: | 65182 |
| Postal Code: | 65400 |
| Mayor: | Thierry Dumestre-Courtiade[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pyrénées Vallées des Gaves |
| Coordinates: | 42.9825°N -0.1747°W |
| Elevation M: | 900 |
| Elevation Min M: | 734 |
| Elevation Max M: | 1617 |
| Area Km2: | 8.46 |
Gaillagos (in French pronounced as /ɡajaɡɔs/; Occitan (post 1500);: Galhagòs) is a commune in the Hautes-Pyrénées department in south-western France.