| Hem-Monacu | |
| Commune Status: | Commune |
| Arrondissement: | Péronne |
| Canton: | Péronne |
| Insee: | 80428 |
| Postal Code: | 80360 |
| Mayor: | Bernard Delefortrie[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Haute Somme |
| Coordinates: | 49.956°N 2.84°W |
| Elevation M: | 52 |
| Elevation Min M: | 42 |
| Elevation Max M: | 112 |
| Area Km2: | 3.66 |
Hem-Monacu is a commune in the Somme department in Hauts-de-France in northern France.
The commune is situated on the D146 road, some 25miles northeast of Amiens, by the banks of the river Somme. The A1 autoroute is less than 1miles away.