| Kiantajärvi | |
| Location: | Suomussalmi, Kainuu |
| Coords: | 65.0333°N 35°W |
| Pushpin Map: | Finland |
| Inflow: | river Hossanjoki, river Pesiönjoki from the lake Pesiöjärvi |
| Outflow: | Emäjoki river, Aittokoski power station |
| Catchment: | Oulujoki |
| Basin Countries: | Finland Kainuu |
| Length: | 50km (30miles) |
| Area: | 187.933km2 |
| Depth: | 7.37m (24.18feet) |
| Max-Depth: | 43m (141feet) |
| Volume: | 1.385km3 |
| Shore: | 527.719km (327.909miles) |
| Elevation: | 199.3m (653.9feet) |
| Frozen: | November–May |
| Islands: | 144 islands, biggest Salonsaari (2.71 km2) |
| Cities: | Suomussalmi |
Kiantajärvi is a rather large lake in Finland, in the Oulujoki main catchment area. It is located in Suomussalmi municipality, in the region of Kainuu. It is the 24th biggest lake in Finland.[1] The lake is narrow and 50 km long in north–south direction.
Kiantajärvi lake played a significant role in the Battle of Suomussalmi during the Winter War in December 1939.
Kiantajärvi is also known for the author Ilmari Kianto, who had his home named Turjanlinna on the shore of Niskaselkä open area. The author's grave is situated in Niettussaari island near his home.