| Alpercatas River | |
| Pushpin Map: | Brazil |
| River System: | Itapecuru River |
| Source1 Location: | Maranhão state |
| Mouth Coordinates: | -6.0297°N -44.3117°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Alpercatas River is a river of Maranhão state in northeastern Brazil. It is a tributary of the Itapecuru River.
Some of the headwaters of the river are protected by the Mirador State Park, created in 1980.