The Una da Aldeia River (Portuguese: Rio Una da Aldeia) is a river in the south of the state of São Paulo, Brazil.

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 River It 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.

This article related to a river in the state of São Paulo is a stub.