| Mutuacá River | |
| Pushpin Map: | Brazil |
| River System: | Pará River |
| Source1 Location: | Marajó island |
| Mouth Location: | Pará River |
| Mouth Coordinates: | -1.7432°N -50.0919°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Mutuacá River (Portuguese: Rio Mutuacá) is a river in the state of Pará, Brazil, a tributary of the Pará River
The river is on the island of Marajó to the northwest of Belém in the delta region where the Amazon and Tocantins rivers empty into the Atlantic Ocean.It runs through part of the Terra Grande-Pracuúba Extractive Reserve, a sustainable use conservation unit created in 2006.It flows south into the Pará River, which connects the Amazon River to the Tocantins River.