| Una da Aldeia River | |
| Pushpin Map: | Brazil |
| River System: | Ribeira de Iguape River |
| Mouth Coordinates: | -24.6368°N -47.4288°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Tributaries Left: | Espraiado River |
The Una da Aldeia River (Portuguese: Rio Una da Aldeia) is a river in the south of the state of São Paulo, Brazil.It is a tributary of the Ribeira de Iguape River.
The Una da Aldeia River originates in the municipality of Juquiá, São Paulo, near the BR-116 highway.In its upper course it is named the Itimirim RiverIt flows in a southeast direction, roughly parallel to the SP-222 highway, entering the municipality of Iguape.It is joined by the Espraiado River from the left, which flows from the Juréia-Itatins Ecological Station.The Una da Aldeia River continues southeast and joins the Ribeira de Iguape River not far from that river's mouth on the Atlantic Ocean.