| Rignieux-le-Franc | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Rignieu-le-Franc (Ain).svg |
| Arrondissement: | Belley |
| Canton: | Meximieux |
| Insee: | 01325 |
| Postal Code: | 01800 |
| Mayor: | Pascal Pain[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.9333°N 5.1833°W |
| Elevation M: | 270 |
| Elevation Min M: | 237 |
| Elevation Max M: | 316 |
| Area Km2: | 15.02 |
Rignieux-le-Franc (in French pronounced as /ʁiɲø lə fʁɑ̃/) is a commune in the Ain department in eastern France.
Property of Alphonse-Louis du Plessis de Richelieu and coming from Fontaines-sur-Saône, an early Christian sarcophagus was stored in Rignieux-le-Franc, before being bought by the Louvre in 1864.
At the end of the 16th century, the lands of Rignieux-le-Franc belonged to the Saillans de Brézenaud.
Rignieux-le-Franc is located about 6 kilometers (3 miles) of Pérouges. The Toison, a tributary of the Ain, flows through the commune.