| Ognon | |
| Map: | Ognon.png |
| Mouth Coordinates: | 47.3142°N 5.4344°W |
| Subdivision Type1: | Country |
| Length: | 214km (133miles) |
| Source1 Elevation: | ±900m (3,000feet) |
| Discharge1 Avg: | 36m3/s |
| Basin Size: | 2308km2 |
The Ognon (pronounced as /fr/) is a river of Eastern France. It is a left tributary of the Saône, which it joins in Pontailler-sur-Saône. Its source is in Haut-du-Them-Château-Lambert in the Vosges Mountains near the Ballon d'Alsace. Its length is 214km (133miles) and its basin area is 2308km2.
The Ognon flows through the following departments and towns: Haute-Saône, with Mélisey, Lure, Villersexel, Pesmes; Doubs, with Rougemont; Jura; Côte-d'Or, with Pontailler-sur-Saône.
Some of its tributaries include: