Kaarina (Finnish pronunciation: [ˈkɑːrinɑ]; Swedish: S:t Karins, i.e. "Saint Catherine's") is a small town and municipality of Finland.
It is located in the Southwest Finland region and is a neighbouring town of Turku, which is the capital of Southwest Finland, therefore Kaarina is a part of the Greater Turku region. The municipality has a population of 34,878 (31 March 2021) and covers an area of 179.58 square kilometres (69.34 sq mi) of which 29.15 km2 (11.25 sq mi) is water. The population density is 231.99 inhabitants per square kilometre (600.9/sq mi).
The municipality is unilingually Finnish, with a Swedish minority and e.g. a Swedish comprehensive school. Bilinguality was proposed but rejected in 2015.
The famous fetish artist Tom of Finland was born in Kaarina. Kaarina has a well known football team Kaarinan Pojat.
The municipality of Kuusisto was consolidated with Kaarina in 1946. The municipality of Piikkio was consolidated with Kaarina on January 1, 2009. At the same time, Kaarina adopted the coat of arms of Piikkio.