| Coolus | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Coolus.svg |
| Arrondissement: | Châlons-en-Champagne |
| Canton: | Châlons-en-Champagne-1 |
| Insee: | 51168 |
| Postal Code: | 51510 |
| Mayor: | Pierre Charlet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Châlons-en-Champagne |
| Coordinates: | 48.9247°N 4.355°W |
| Elevation M: | 84 |
| Elevation Min M: | 82 |
| Elevation Max M: | 137 |
| Area Km2: | 13.18 |
Coolus (in French pronounced as /kɔly/) is a commune in the Marne department in north-eastern France. It gave its name to the Coolus helmet, a type of ancient Celtic and Roman helmet.