| Monthieux | |
| Commune Status: | Commune |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Villars-les-Dombes |
| Insee: | 01261 |
| Postal Code: | 01390 |
| Mayor: | Philippe Paillasson[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Dombes |
| Coordinates: | 45.9578°N 4.9411°W |
| Elevation M: | 305 |
| Elevation Min M: | 281 |
| Elevation Max M: | 311 |
| Area Km2: | 10.75 |
Monthieux (in French pronounced as /mɔ̃tjø/) is a commune in the Ain department in eastern France.