| Rognon | |
| Map: | Rognon.png |
| Mouth Coordinates: | 48.3757°N 5.1614°W |
| Subdivision Type1: | Country |
| Length: | 73km (45miles) |
The Rognon (in French pronounced as /so/) is a 73 km long river in France, right tributary of the Marne. Its source is near the village Is-en-Bassigny. It flows generally northwest, through the department of Haute-Marne.The Rognon flows into the Marne at Mussey-sur-Marne, south of Joinville. Its largest tributary is the Sueurre.