| Saint-Algis | |
| Commune Status: | Commune |
| Arrondissement: | Vervins |
| Canton: | Vervins |
| Insee: | 02670 |
| Postal Code: | 02260 |
| Mayor: | Martine Basse[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Thiérache du Centre |
| Coordinates: | 49.8986°N 3.8247°W |
| Elevation M: | 180 |
| Elevation Min M: | 112 |
| Elevation Max M: | 191 |
| Area Km2: | 6.89 |
Saint-Algis is a commune in the Aisne department in Hauts-de-France in northern France.