| Préchac-sur-Adour | |
| Commune Status: | Commune |
| Arrondissement: | Mirande |
| Canton: | Pardiac-Rivière-Basse |
| Insee: | 32330 |
| Postal Code: | 32160 |
| Mayor: | François Lassalle[1] |
| Term: | 2023 - 2026 |
| Intercommunality: | Bastides et vallons du Gers |
| Coordinates: | 43.6031°N -0.0014°W |
| Elevation M: | 132 |
| Elevation Min M: | 126 |
| Elevation Max M: | 142 |
| Area Km2: | 4.37 |
Préchac-sur-Adour (pronounced as /fr/, literally Préchac on Adour; oc|Preishac d'Ador) is a commune in the Gers department in southwestern France.