Kuusjoki (Finnish pronunciation: [ˈkuːsjoki]) is a former municipality of Finland. It was consolidated with Salo on January 1, 2009.

It is located in the province of Western Finland and is part of the Southwest Finland region. The municipality had a population of 1,781 (2004-12-31) and covered an area of 122.57 km² of which 0.11 km² is water. The population density was 14.54 inhabitants per km².

The municipality was unilingually Finnish.

Media related to Kuusjoki at Wikimedia Commons

• http://www.kuusjoki.fi/ – Official website (in Finnish)

60°31′15″N 23°13′15″E / 60.52083°N 23.22083°E / 60.52083; 23.22083