Janakkala (Finnish pronunciation: [ˈjɑnɑˌkːɑlɑ]) is a municipality of Finland.

Janakkala is located along Highway 3 (E12) in the province of Southern Finland and is part of the Tavastia Proper region.

To the south, Janakkala shares a boundary with Riihimäki, the northern neighbour being Hämeenlinna.

Actress Ida Aalberg was born in 1857 in Leppäkoski village in Janakkala.

An aisle line of partition is a reference to Hakoinen Castle into the mountain, and the upper two arrows encircling the cross, symbol of Christianity, the image of the Crusades battles.