| Building Name: | Rieux Cathedral French: Cathédrale de la Nativité-de-Marie de Rieux |
| Location: | Rieux,  France |
| Geo: | 43.2583°N 1.2033°W |
| Religious Affiliation: | Roman Catholic Church |
| Rite: | Roman |
| Region: | Rieux-Volvestre |
| Province: | Bishopric of Rieux |
| Status: | Cathedral |
| Functional Status: | Active |
| Architecture: | yes |
| Architecture Type: | church |
| Architecture Style: | Southern French Gothic |
Rieux Cathedral (French: Cathédrale de la Nativité-de-Marie de Rieux) is a Roman Catholic church located in the town of Rieux-Volvestre, France. It has been listed since 1923 as a monument historique by the French Ministry of Culture.[1]
The cathedral was formerly the seat of the Bishopric of Rieux, founded in 1317 and de-established by the Concordat of 1801.