| Jonzier-Épagny | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Jonzier-Epagny.svg |
| Arrondissement: | Saint-Julien-en-Genevois |
| Canton: | Saint-Julien-en-Genevois |
| Insee: | 74144 |
| Postal Code: | 74520 |
| Mayor: | Michel Mermin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Genevois |
| Coordinates: | 46.0714°N 5.9906°W |
| Elevation Min M: | 518 |
| Elevation Max M: | 733 |
| Area Km2: | 7.16 |
Jonzier-Épagny (in French pronounced as /ʒɔ̃zje epaɲi/; Zhonvi-Épanyi) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France.
The commune comprises three hamlets (Les Barraques, Épagny, Vigny) and a place named Mont-Sion.
The commune covers 716 ha of glacial moraine from the Rhône, deposited about 10,000 years ago, and called the Montagne de Sion. The highest point in the commune is at 733 m.