| Sains-Richaumont | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Sains-Richaumont.svg |
| Arrondissement: | Vervins |
| Canton: | Marle |
| Insee: | 02668 |
| Postal Code: | 02120 |
| Mayor: | Jean-Pierre Vieville[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Thiérache du Centre |
| Coordinates: | 49.8247°N 3.71°W |
| Elevation M: | 156 |
| Elevation Min M: | 96 |
| Elevation Max M: | 159 |
| Area Km2: | 12.46 |
Sains-Richaumont (in French pronounced as /sɛ̃ ʁiʃomɔ̃/) is a commune in the Aisne department in Hauts-de-France in northern France.