| Railleu | |
| Native Name: | Ralleu |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Railleu 66.svg |
| Arrondissement: | Prades |
| Canton: | Les Pyrénées catalanes |
| Insee: | 66157 |
| Postal Code: | 66360 |
| Mayor: | Patrice Camps[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 42.5869°N 2.1831°W |
| Elevation M: | 1412 |
| Elevation Min M: | 1150 |
| Elevation Max M: | 2080 |
| Area Km2: | 9.97 |
Railleu (pronounced as /fr/; ca|Ralleu) is a commune in the Pyrénées-Orientales department in southern France.
Railleu is in the canton of Les Pyrénées catalanes and in the arrondissement of Prades.