Iniö is a former municipality of Finland. On 1 January 2009, it was consolidated with Houtskär, Korpo, Nagu and Pargas to form the new town of Väståboland.
It is located in the province of Western Finland (Länsi-Suomen lääni) and is part of the Southwest Finland region. The municipality had a population of 253 (2004-12-31) and covered an area of 63.86 km2 (24.66 sq mi) (excluding sea) of which 0.17 km2 (0.07 sq mi) is inland water. The population density was 3.97 inhabitants per km².
The municipality was bilingual, with majority being Swedish and minority Finnish speakers.
Coordinates: 60°23′50″N 21°23′10″E / 60.39722°N 21.38611°E