| Orbessan | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Orbessan (Gers).svg |
| Arrondissement: | Mirande |
| Canton: | Auch-3 |
| Insee: | 32300 |
| Postal Code: | 32260 |
| Mayor: | Alain Bourdette[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | Val de Gers |
| Coordinates: | 43.5447°N 0.6103°W |
| Elevation M: | 168 |
| Elevation Min M: | 152 |
| Elevation Max M: | 273 |
| Area Km2: | 8.24 |
Orbessan (in French pronounced as /ɔʁbɛsɑ̃/) is a commune in the Gers department in southwestern France.
Orbessan is located 13 km south of Auch and 6 km north of Seissan, along the Gers river.