| Mare aux Vacoas | |
| Location: | Mauritius |
| Coordinates: | -20.3667°N 87°W |
| Type: | reservoir |
| Pushpin Map: | Mauritius |
| Pushpin Map Alt: | Location of the reservoir in Mauritius. |
Mare aux Vacoas is the largest reservoir in Mauritius. It is located in Plaines Wilhems, in the southwest of the island, to the south of the town of Curepipe. It has a capacity of and provides water to the upper Plaines Wilhems and to Moka. It was constructed in 1885.