| Iso Lamujärvi | |
| Pushpin Map: | Finland |
| Location: | Pyhäntä municipality |
| Coords: | 64.0167°N 41°W |
| Type: | Lake |
| Outflow: | Lamujoki |
| Catchment: | Siikajoki |
| Basin Countries: | Finland |
| Area: | 25.85km2 |
| Depth: | 3.2m (10.5feet) |
| Max-Depth: | 11.69m (38.35feet) |
| Volume: | 0.083km3 |
| Shore: | 32.84km (20.41miles) |
| Elevation: | 136.6m (448.2feet) |
| Frozen: | December–May |
| Islands: | Honkasaari, Pikku Honkasaari, Kutusaari, Lehtosaari, Matinsaari, Pitkäsaari, Selkäsaari, Tölpänsaari. |
Iso Lamujärvi is a medium-sized lake in the Siikajoki main catchment area. It is located in the region Northern Ostrobothnia in Finland.[1]
There are eight islands in the lake.