| Monceau-le-Waast | |
| Commune Status: | Commune |
| Arrondissement: | Laon |
| Canton: | Marle |
| Insee: | 02493 |
| Postal Code: | 02840 |
| Mayor: | Nicole Buirette[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de la Serre |
| Coordinates: | 49.6197°N 3.7144°W |
| Elevation M: | 80 |
| Elevation Min M: | 68 |
| Elevation Max M: | 106 |
| Area Km2: | 5.41 |
Monceau-le-Waast is a commune in the Aisne department in Hauts-de-France in northern France.