Kauniainen (Finnish pronunciation: [ˈkɑuniˌɑinen]; Swedish: Grankulla) is a small town and a municipality of 9,395 inhabitants (31 March 2016) in the Helsinki Metropolitan Area, Finland. It is surrounded by the City of Espoo, in Greater Helsinki. Kauniainen was founded by a corporation in 1906, AB Grankulla, that parcelled land and created a suburb for villas; Kauniainen received the status of a market town in 1920, the Finnish name in 1949, and the title of kaupunki ("city, town") in 1972.

The local taxation rate in Kauniainen is the lowest in Finland (16.5%), which makes the city attractive to the highest earners. This in turn makes the average income generally high, making it possible to keep the taxation rate low without compromising the service to the inhabitants.

Approximately 7,001,580,000,000,000,000♠58% of the population have Finnish as their mother tongue while 7,001,380,000,000,000,000♠38% are Swedish speakers. The dominant party in the city council has traditionally been the Swedish People's Party.

Today, Kauniainen is the only municipality in Finland to be fully enclosed by another municipality.

The Swedish name Grankulla is composed by the Swedish words "gran" (spruce) and "kulle" (hill) and has been in use in this form since the beginning of the 1900s. Earlier the place was known under its dialectal form Gränkull. The name Gränkull is found on modern maps as the name of the hill where the water tower in Kauniainen is located. The Finnish name of the town, Kauniainen, is derived from the name of a homestead that was located in Kauniainen called Kauniais. It was named after an estate near Tampere. The Finnish name was taken into use in the 1930s and was made the official name of the town alongside the Swedish name in 1949.

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