| Castillon-Debats | |
|---|---|
| Coordinates: 43°43′49″N0°13′02″E / 43.7303°N .21722°E | |
| Country | France | 
| Region | Occitania | 
| Department | Gers | 
| Arrondissement | Auch | 
| Canton | Fezensac | 
| Intercommunality | Artagnan de Fézensac | 
| Government | |
| • Mayor (2020–2026) | Hubert Raffin [1] | 
| Area 1 | 35.05 km2 (13.53 sq mi) | 
| Population  (2022) [2]  | 333 | 
| • Density | 9.5/km2 (25/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code |  32088 /32190 | 
| Elevation | 117–227 m (384–745 ft) (avg. 223 m or 732 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Castillon-Debats (Occitan : Castilhon Debats) is a commune in the Gers department in southwestern France.
The Auzoue forms part of the commune's eastern border and flows north through its northeastern part.
 
 | Year | Pop. | ±% | 
|---|---|---|
| 1962 | 491 | — | 
| 1968 | 432 | −12.0% | 
| 1975 | 371 | −14.1% | 
| 1982 | 377 | +1.6% | 
| 1990 | 348 | −7.7% | 
| 1999 | 301 | −13.5% | 
| 2008 | 321 | +6.6% |