| Dadou | |
| Map: | Dadou (rivière).png |
| Source1 Location: | Saint-Salvi-de-Carcavès |
| Source1 Coordinates: | 43.7886°N 2.6256°W |
| Mouth Location: | Agout |
| Mouth Coordinates: | 43.7364°N 1.79°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | France |
| Length: | 115.8km (72miles) |
| Source1 Elevation: | 860m (2,820feet) |
| Mouth Elevation: | 110m (360feet) |
| Discharge1 Avg: | 12m3/s |
| Basin Size: | 858km2 |
The Dadou (fr|le Dadou) is a 115.8km (72miles) long river in the Tarn department in southern France. Its source is near Saint-Salvi-de-Carcavès. It flows generally west. It is a right tributary of the Agout, into which it flows near Ambres.
The Dadou flows west, crossing the Tarn department, through the following communes, ordered from source to mouth:
