Kaskinen (Kaskö in Swedish) is a municipality of Finland. It is located in the province of Western Finland and is part of the Ostrobothnia region. The municipality has a population of 1,558 (2003) and covers an area of 10.23 km² of which 0.15 km² is water. The population density is 152.3 inhabitants per km².

The municipality is bilingual, with majority being Finnish and minority Swedish speakers.

Kaskinen is the smallest town in Finland.