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) and covered an area of 163.40 square kilometres (63.09 sq mi) of which 42.11 km (16.26 sq mi) was water. The population density was 12.153/km (31.475/sq mi).

Karjalohja was consolidated with the town of Lohja on 1 January 2013.

The municipality was unilingually Finnish.

Villages

Prior to its consolidation into Lohja in 2013, Karjalohja contained of the following villages:

• Härjänvatsa, Ilmoniemi, Immola, Karkali, Kattelus, Kourjoki, Kuusia, Kärkelä, Lohjantaipale, Lönnhammar (Linhamari), Maila, Makkarjoki, Murto, Mustlahti, Nummijärvi, Pappila, Pellonkylä, Pipola, Pitkälahti (Långvik), Puujärvi, Pyöli, Saarenpää, Sakkola, Suurniemi, Särkjärvi, Tallaa and Tammisto

Politics

Results of the 2011 Finnish parliamentary election in Karjalohja:

• True Finns 21.9%
• Social Democratic Party 20.3%
• National Coalition Party 19.9%
• Centre Party 16.5%
• Green League 11.3%
• Left Alliance 4.2%
• Swedish People's Party 1.8%
• Christian Democrats 1.5%

People born in Karjalohja

• Artturi Aalto (1876–1937)