| Saulx | |
| Map: | Saulx.png |
| Mouth Coordinates: | 48.7428°N 4.5817°W |
| Subdivision Type1: | Country |
| Length: | 115km (71miles) |
The Saulx (in French pronounced as /so/) is a 115 km long river in France, right tributary of the Marne. Its source is near the village Germisay. It flows generally northwest, through the following départements and towns:
Montiers-sur-Saulx, Stainville
Sermaize-les-Bains, Pargny-sur-Saulx, Vitry-le-François
The Saulx flows into the Marne in Vitry-le-François. Its main tributaries are the Ornain and the Chée. The part of the Marne-Rhine Canal between Vitry-le-François and Sermaize-les-Bains runs parallel to the Saulx.