| Onnion | |
| Commune Status: | Commune |
| Arrondissement: | Bonneville |
| Canton: | Bonneville |
| Insee: | 74205 |
| Postal Code: | 74490 |
| Mayor: | André Gervais[1] |
| Term: | 2024 - 2026 |
| Coordinates: | 46.1719°N 6.4797°W |
| Elevation Min M: | 683 |
| Elevation Max M: | 1581 |
| Area Km2: | 18.97 |
| Website: | Villagedonnion.free.fr |
Onnion (in French pronounced as /ɔnjɔ̃/; Onion) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France.