Kiukainen (Swedish: Kiukais) is a former municipality of Finland. It was consolidated with Eura on 1 January 2009.

It is located in the Satakunta region. The municipality had a population of 3,408 (2003) and covered an area of 149.88 km of which 0.22 km is water. The population density was 22.7 inhabitants per km.

In Kiukainen there are many ancient gravehills made from piled stones. Largest of them is called Kuninkaanhauta, "the king's grave", located in the Panelia village. It is the biggest of its type in Nordic countries. The Stone Age Kiukainen culture is named after Kiukainen municipality.

The municipality was unilingually Finnish.

Before the 2009 consolidation, Kiukainen was twinned with:

• Boksitogorsk, Leningrad Oblast, Russia (current status unknown)

• Timo Kalli (1947 – )
• Kielo Tommila (1950 – )
• Eveliina Suonpää (1995 – )

Media related to Kiukainen at Wikimedia Commons Kiukainen travel guide from Wikivoyage

61°12′25″N 22°05′00″E / 61.20694°N 22.08333°E / 61.20694; 22.08333