| Saint-Élix-Theux | |
| Commune Status: | Commune |
| Arrondissement: | Mirande |
| Canton: | Mirande-Astarac |
| Insee: | 32375 |
| Postal Code: | 32300 |
| Mayor: | Jean-Michel Laffitte[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.4297°N 0.4706°W |
| Elevation M: | 209 |
| Elevation Min M: | 193 |
| Elevation Max M: | 302 |
| Area Km2: | 8.37 |
Saint-Élix-Theux is a commune in the Gers department in southwestern France.
The Petite Baïse flows north through the eastern part of the commune.