Köhniönjärvi (Finnish pronunciation: [ˈkø̞hniø̞jˌjærʋi]) is a lake in the Kypärämäki district of Jyväskylä, Finland, covering an area of 29 hectares (72 acres).

The catchment area extends to the southern slopes of the hill Laajavuori in the north and to the settlement of Taka-Keljo in the south, also covering much of the Kypärämäki and Keltinmäki districts.

[5] There are multiple smaller lakes or ponds within the catchment area, including Soidenlampi, Mustalampi and Kotalampi in the south as well as Rimminlampi, Killervä and Riihilampi in the north.

Due to high nutrient levels and the small size of the lake causing its water to warm up quickly, cyanobacteria is found almost every summer, however generally not to an extent where swimming would be unsafe.

[2] The southern shores of the lake are covered by relatively old spruce-dominated forest, providing habitat for Siberian flying squirrels, which are endangered in Finland.