Siuntio, or Sjundeå in Swedish is a municipality of Finland.
It is located in the province of Southern Finland and is part of the Uusimaa region. The municipality has a population of 5,312 (2004-12-31) and covers an area of 248.18 km² of which 6.63 km² is water. The population density is 21.99 inhabitants per km².
The municipality is bilingual with majority being Finnish and minority Swedish speakers.
Alfred