| Roseau River | |
| Name Other: | La Grande Riviere |
| Pushpin Map: | Saint Lucia |
| Pushpin Map Caption: | Location of mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Saint Lucia |
| Subdivision Type2: | Region |
| Subdivision Name2: | Anse-la-Raye Quarter |
| Mouth: | Roseau Bay, Caribbean Sea |
| Mouth Location: | west of Roseau, Saint Lucia |
| Mouth Coordinates: | 13.96°N -61.0324°W |
The Roseau River is a river in the Anse-la-Raye Quarter of the island country of Saint Lucia. It flows north and then west from the central highlands in the south of the island, reaching the Caribbean Sea to the north of the town of Anse la Raye. The Roseau river is also the longest in the country and is dammed by the John Compton Dam near Millet.[1] [2] [3]