The Pacajá River (Portuguese: Rio Pacajá) is a river of Pará state in north-central Brazil.

It is a tributary of the Pará River, a channel that connects the Amazon and Tocantins rivers to the south of Marajó island.

The basin of the Pacajá River is in the Xingu–Tocantins–Araguaia moist forests ecoregion.

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