| Billiat | |
| Commune Status: | Commune |
| Arrondissement: | Nantua |
| Canton: | Valserhône |
| Insee: | 01044 |
| Postal Code: | 01200 |
| Mayor: | Jean-Marc Beauquis[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Bellegardien |
| Coordinates: | 46.0667°N 5.7833°W |
| Elevation M: | 500 |
| Elevation Min M: | 370 |
| Elevation Max M: | 1300 |
| Area Km2: | 13.70 |
Billiat (in French pronounced as /bilja/) is a commune in the Ain department in eastern France.