| Marquaix | |
| Commune Status: | Commune |
| Arrondissement: | Péronne |
| Canton: | Péronne |
| Insee: | 80516 |
| Postal Code: | 80240 |
| Mayor: | Claude Celma[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Haute Somme |
| Coordinates: | 49.9458°N 3.0758°W |
| Elevation M: | 68 |
| Elevation Min M: | 65 |
| Elevation Max M: | 142 |
| Area Km2: | 5.29 |
Marquaix (pronounced as /fr/) is a commune in the Somme department in Hauts-de-France in northern France.
Marquaix is situated on the D6 road, some 15miles northwest of Saint-Quentin.