Siuntio (Finnish: [ˈsiu̯ntio]; Swedish: Sjundeå) is a municipality in the Uusimaa region of Southern Finland. Its neighboring municipalities are Ingå to the west, Kirkkonummi, to the east, Lohja to the north-west, and Vihti to the north. It is 46 kilometres (29 mi) west of Helsinki.
As of 2021, the population was 6,181 with a population density of 25.62 inhabitants per square kilometre (66.4/sq mi). The municipality covers an area of 266.12 square kilometres (102.75 sq mi), of which 24.96 km2 (9.64 sq mi) is water.
Siuntio is a bilingual municipality with Finnish and Swedish as its official languages. The population consists of 66% Finnish speakers, 26% Swedish speakers, and 8% speakers of other languages. Previously, the majority of the population spoke Swedish until the 1980s.
Siuntio's motto is "Ota rauhallisesti - Ta det lugnt", which means "take it easy" in Finnish and Swedish respectively. The municipality's rebranding program introduced the new motto along with a new logo in 2021.
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