Kisko () is a former municipality of Finland. It was consolidated with Salo on 1 January 2009.
It is located in the province of Western Finland and is part of the Southwest Finland region. The municipality had a population of 1,869 (2004-12-31) and covered an area of 284.13 kmò of which 30.98 kmò is water. The population density was 7.38 inhabitants per kmò.
The municipality was unilingually Finnish.
Kisko was first mentioned in 1347, when it was a part of the parish of Pohja. It became an independent parish somewhere between the 1400s and the 1500s. At that time, the parish of Kisko also included Suomusjärvi, which became a separate parish in 1898.
Kisko was consolidated with Salo in 2009.