| Marchésieux | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Marchésieux (Manche).svg |
| Arrondissement: | Coutances |
| Canton: | Agon-Coutainville |
| Insee: | 50289 |
| Postal Code: | 50190 |
| Mayor: | Anne Hebert[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 49.1883°N -1.29°W |
| Elevation M: | 24 |
| Elevation Min M: | 0 |
| Elevation Max M: | 22 |
| Area Km2: | 19.89 |
Marchésieux (in French pronounced as /maʁʃezjø/) is a commune in the Manche department in Normandy in north-western France.