| Rieux | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Sézanne-Brie et Champagne |
| Insee: | 51460 |
| Postal Code: | 51210 |
| Mayor: | Laurent Épinat[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.8514°N 3.5011°W |
| Elevation M: | 162 |
| Area Km2: | 11.56 |
Rieux (in French pronounced as /ʁijø/) is a commune in the Marne department in north-eastern France.