Hausjärvi
Hausjärvi is a municipality of Finland. Its seat is in Oitti.

It is located in the province of Southern Finland and is part of the Tavastia Proper region. The municipality has a population of  () and covers an area of  of which  is water. The population density is .

Geographically, and to some extent politically, Hausjärvi is characterized by its three population centres, Hikiä (population 1,135), Oitti (population 2,416) and Ryttylä (population 1,842). The administrative center of the municipality is Oitti, but politically there sometimes emerges debate on which centres should be developed and/or made targets of public investment.

The municipality is unilingually Finnish.

International relations

Twin towns – Sister cities
 Naie, Japan (since 1995)
 Väike-Maarja Parish, Estonia (since 1989)