| Yon | |
| Pushpin Map: | France#France Pays de la Loire |
| Source1 Location: | Saint-Martin-des-Noyers |
| Source1 Coordinates: | 46.7164°N -1.2528°W |
| Mouth Coordinates: | 46.5067°N -1.2911°W |
| Subdivision Type1: | Country |
| Length: | 55.6km (34.5miles) |
| Source1 Elevation: | 100m (300feet) |
| Mouth Elevation: | 5m (16feet) |
| Discharge1 Avg: | 8m3/s |
The Yon (in French pronounced as /jɔ̃/) is a 55.6km (34.5miles) long river in the Vendée département, western France. Its source is at Saint-Martin-des-Noyers. It flows generally south. It is a right tributary of the Lay into which it flows between Rosnay and Le Champ-Saint-Père.
This list is ordered from source to mouth: