| Saint-Waast | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Waast-la-Vallée (Nord).svg |
| Arrondissement: | Avesnes-sur-Helpe |
| Canton: | Aulnoye-Aymeries |
| Insee: | 59548 |
| Postal Code: | 59570 |
| Mayor: | Eric Hiroux[1] |
| Term: | 2023 - 2026 |
| Intercommunality: | CC Pays de Mormal |
| Coordinates: | 50.305°N 3.748°W |
| Elevation M: | 120 |
| Elevation Min M: | 85 |
| Elevation Max M: | 142 |
| Area Km2: | 5.91 |
Saint-Waast is a commune in the Nord department in northern France.[2]
The Carrière des Nerviens Regional Nature Reserve is partially located in the communal territory just south-east of the town centre.