The Maicuru River is a river of Pará state in north-central Brazil, a tributary of the Amazon that discharges into that river via the Lago Grande de Monte Alegre.

The river basin lies partly within the 4,245,819 hectares (10,491,650 acres) Grão-Pará Ecological Station, the largest fully protected tropical forest conservation unit on the planet.

[5] Part of the river's basin is in the Maicuru Biological Reserve.

[6] The river is also fed by streams in the 216,601 hectares (535,230 acres) Mulata National Forest, a sustainable use conservation unit created in 2001.

This article related to a river in Pará, Brazil is a stub.