Maués Açu River (Portuguese: Rio Maués Açu) is a river of the northwest Brazilian state of Amazonas.

[1] It is located east of the Madeira River and south of the Amazon River.

It is connected to both these, as well as several other smaller rivers, via the Paraná Urariá channel.

The town of Maués is located on the eastern bank of the river near the point where it merges into Paraná Urariá.

This article related to a river in the Brazilian state of Amazonas is a stub.