| Iriri River | |
| Map Size: | 300 |
| Pushpin Map Size: | 300 |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Length: | 1151km (715miles)[1] |
| Discharge1 Location: | Confluence of Xingu (near mouth) |
| Discharge1 Min: | 56.3m3/s[2] |
| Discharge1 Avg: | 3028m3/s[3] |
| Discharge1 Max: | 14025m3/s[4] |
| Source1 Location: | Pará, Brazil |
| Source1 Elevation: | 619m (2,031feet) |
| Mouth: | Xingu River |
| Mouth Coordinates: | -3.8167°N -52.6056°W |
| Mouth Elevation: | 116m (381feet) |
| Basin Size: | 141943km2[5] |
| Tributaries Left: | Curuá River, Catete River, Chiché River, Ipiranga River |
| Tributaries Right: | Novo River, Carajarí River, Xinxim River, Iriri Novo River |
| Discharge2 Location: | Pedra do Ó gauge station (130 km upstream of mouth - Basin size 123827km2 |
| Discharge2 Min: | 49m3/s[6] |
| Discharge2 Avg: | 2748m3/s[7] |
| Discharge2 Max: | 12235m3/s[8] |
The Iriri River (pt|Rio Iriri pronounced as /pt-Br/; txu|label=[[Kayapó language|Mẽbêngôkre]]|Kororoti pronounced as /txu/) is a large tributary of the Xingu River in Brazil, in the state of Pará. It is 1300km (800miles) long making it the 116th longest river in the world (with Krishna River, India) and the 15th longest in the Amazon basin. The headwaters are the traditional home of the Panará people.
The river rises in the 342192ha Nascentes da Serra do Cachimbo Biological Reserve, a strictly protected conservation unit established in 2005 in the Serra do Cachimbo. It is one of the headwaters of the Xingu River.It flows for before joining the Xingu, running through the 3373133.89ha Terra do Meio Ecological Station.The river varies greatly in volume depending on the season, and in the dry season includes waterfalls, rocks and rapids.
The Iriri River flows through the Tapajós–Xingu moist forests ecoregion.The river is rich in fish, including many species found only there and in the Xingu. Large sections remain unexplored due to its remoteness in a region surrounded by Amazon rainforest, and sections with strong current and cataracts.