| Brénaz | |
| Arrondissement: | Belley |
| Canton: | Plateau d'Hauteville |
| Commune: | Arvière-en-Valromey |
| Insee: | 01059 |
| Postal Code: | 01260 |
| Coordinates: | 45.9483°N 5.7228°W |
| Elevation M: | 650 |
| Elevation Min M: | 580 |
| Elevation Max M: | 1425 |
| Area Km2: | 9.79 |
| Population: | 101 |
| Population Date: | 2021 |
| Population Footnotes: | [1] |
Brénaz (pronounced as /fr/) is a former commune in the Ain department in eastern France. On 1 January 2019, it was merged into the new commune Arvière-en-Valromey.[2]
The commune lies west of the Grand Colombier (Ain).