| Lake Haapajärvi | |
| Pushpin Map: | Finland |
| Coords: | 63.5757°N 26.9666°W |
| Basin Countries: | Finland |
Lake Haapajärvi is a middle size lake in the area of Iisalmi, Northern Savonia, Finland. There are 38 lakes with the name Haapajärvi in Finland, with this particular lake being the largest in size.