| Montjaux | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Montjaux (Aveyron).svg |
| Arrondissement: | Millau |
| Canton: | Tarn et Causses |
| Insee: | 12153 |
| Postal Code: | 12490 |
| Mayor: | Colette Lembert[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 44.1033°N 2.9064°W |
| Elevation M: | 600 |
| Elevation Min M: | 340 |
| Elevation Max M: | 1087 |
| Area Km2: | 31.48 |
Montjaux (pronounced as /fr/; in Occitan Mont Jòus from the Latin Mons Jovis (Mount Jupiter)) is a commune in the Aveyron department in southern France.