A former municipality in Finland, established in 1847 from Kiikka and merged in 2013 to Sastamala.
Between 1847 and 1917 Kiikoinen was part of the autonomous Grand Duchy of Finland (Suomen suuriruhtinaanmaa or Suomen suuriruhtinaskunta in Finnish, Storfurstendömet Finland in Swedish, Великое княжество Финляндское in Russian), belonging to Russia, being an administrative unit of
- the Province of Turku and Pori (Turun ja Porin lääni in Finnish, Åbo och Björneborgs län in Swedish).
Since 1917 Kiikoinen was part of independent Finland, being an administrative unit of
- the Province of Turku and Pori (Turun ja Porin lääni in Finnish, Åbo och Björneborgs län in Swedish), 1917–1997, and
- the Province of Western Finland (Länsi-Suomen lääni in Finnish, Västra Finlands län in Swedish), 1997–2009.