| Illiat | |
| Commune Status: | Commune |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Châtillon-sur-Chalaronne |
| Insee: | 01188 |
| Postal Code: | 01140 |
| Mayor: | Richard Labalme[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Val de Saône Centre |
| Coordinates: | 46.1911°N 4.8892°W |
| Elevation M: | 241 |
| Elevation Min M: | 190 |
| Elevation Max M: | 257 |
| Area Km2: | 20.37 |
Illiat (in French pronounced as /ilja/; Ilyê) is a commune in the Ain department in eastern France.