| Lake Iijärvi | |
| Pushpin Map: | Finland |
| Coords: | 64.4933°N 29.1136°W |
| Catchment: | Oulujoki |
| Basin Countries: | Finland |
| Area: | 21.969km2 |
| Depth: | 5.43m (17.81feet) |
| Max-Depth: | 31m (102feet) |
| Volume: | 0.119km3 |
| Shore: | 101.9km (63.3miles) |
| Elevation: | 134.3m (440.6feet) |
| Frozen: | November-May |
| Islands: | Heikkisensaari, Putkonsaari |
| Cities: | Ristijärvi |
Lake Iijärvi (Ristijärvi) is a medium-sized lake in the Oulujoki main catchment area. It is located in the Kainuu region, northern Finland.[1]