| Cadeillan | |
| Commune Status: | Commune |
| Arrondissement: | Auch |
| Canton: | Val de Save |
| Insee: | 32069 |
| Postal Code: | 32220 |
| Mayor: | Denys Granier-Deferre[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Savès |
| Coordinates: | 43.4219°N 0.8481°W |
| Elevation M: | 213 |
| Elevation Min M: | 177 |
| Elevation Max M: | 247 |
| Area Km2: | 4.26 |
Cadeillan (in French pronounced as /kadɛjɑ̃/; Occitan (post 1500);: Cadelhan de Savés) is a commune in the Gers department in southwestern France.
The river Gesse forms all of the commune's western and northwestern borders, then flows into the Save, which forms all of the commune's eastern and northeastern borders.