| Cadeilhan | |
| Commune Status: | Commune |
| Arrondissement: | Condom |
| Canton: | Fleurance-Lomagne |
| Insee: | 32068 |
| Postal Code: | 32380 |
| Mayor: | Édouard Schmidt[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Lomagne Gersoise |
| Coordinates: | 43.8297°N 0.7722°W |
| Elevation M: | 180 |
| Elevation Min M: | 122 |
| Elevation Max M: | 194 |
| Area Km2: | 8.43 |
Cadeilhan (in French pronounced as /kadɛjɑ̃/; Occitan (post 1500);: Cadelhan) is a commune in the Gers department in southwestern France.
The river Auroue forms most of the commune's western border.