Karjalohja (Finnish: [ˈkɑrjɑˌlohjɑ]; Swedish: Karislojo) is a former municipality of Finland.

It is located in the province of Southern Finland and is part of the Uusimaa region.

Before merging into Lohja, the municipality had a population of 1,474 (31 December 2012)[2] and covered an area of 163.40 square kilometres (63.09 sq mi) of which 42.11 km2 (16.26 sq mi) was water.

With Nummi-Pusula, Karjalohja was consolidated with the town of Lohja on 1 January 2013.

[4] Prior to its consolidation into Lohja in 2013, Karjalohja contained the following villages: