| Mananantanana | |
| Map: | Madagascar rivers.svg |
| Subdivision Type1: | Country |
| Subdivision Name1: | Madagascar |
| Subdivision Type3: | Region |
| Subdivision Name3: | Haute Matsiatra |
| Subdivision Type5: | Cities |
| Length: | 350km (220miles) |
| Source1 Elevation: | 1850 m |
| Mouth: | Mangoky River |
| Mouth Coordinates: | -21.4333°N 45.5667°W |
| Progression: | Solila, Ambalavao |
| River System: | Mangoky River |
| Basin Size: | 7680 km2 |
| Tributaries Right: | Manambovo |
The Mananantanana is a river in Haute Matsiatra region, is located in eastern Madagascar. It flows into the Mangoky River.[1]
It has its springs in the Andringitra Massif. Together with the Matsiatra it forms the Mangoky River.