Houtskär ([ˈhuːtʃæːr]; Finnish: Houtskari [ˈhoutskɑri]) is a former municipality of Finland. On 1 January 2009, it was consolidated with Iniö, Korpo, Nagu and Pargas to form the municipality Pargas (briefly named Väståboland).
It is located in the Archipelago Sea in the province of Western Finland and is part of the Southwest Finland region. The municipality had a population of 621 (as of 31 December 2008) and covered a land area of 119.93 square kilometres (46.31 sq mi). The population density was 5.18 inhabitants per square kilometre (13.4/sq mi).
The municipality was bilingual with the majority (86%) being Swedish and minority Finnish speakers.
There are three stores in Houtskär, a bank and post office, and the church of Santa Maria in Näsby center. At various times throughout the year dances, accompanied by live music, are held which are an old tradition kept alive by both older and younger participants who dance in a variety of styles.
Houtskär consists of a group of bigger islands and a large number of smaller islands in the surrounding sea area. Communications to the mainland is by the ”Archipelago road” through Pargas, Nagu and Korpo, with three ferries considered part of the road network, the trip with the last one from Korpo to Houtskär lasting half an hour. The main islands are connected by bridges or cable ferries, the outer inhabited islands usually have daily connections with ship-like ferries.