Houtskari (Houtskär in Swedish) is a municipality of Finland.

It is located in the province of Western Finland and is part of the Finland Proper region. The municipality has a population of 662 and covers an area of 121.18 km² of which 0.65 km² is water. The population density is 5.5 inhabitants per km².

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