| Orval-sur-Sienne | |
| Commune Status: | Commune |
| Arrondissement: | Coutances |
| Canton: | Coutances |
| Insee: | 50388 |
| Postal Code: | 50660 |
| Mayor: | Joël Doyère[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 49.014°N -1.471°W |
| Area Km2: | 19.04 |
Orval-sur-Sienne (in French pronounced as /ɔʁval syʁ sjɛn/) is a commune in the department of Manche, northwestern France. The municipality was established on 1 January 2016 by merger of the former communes of Montchaton and Orval.[2]