Kokemäki (Swedish: Kumo) is a Finnish city located in the province of Satakunta. The city has 7,104 inhabitants and covers an area of ​​531.26 km2, of which 50.78 km2 are water bodies. The population density is 14.79 inhabitants / km2. The economic structure is broken down by industry as follows: primary production 9.0%, processing 30.0%, services 61.0%.

The neighboring municipalities of Kokemäki are Eura, Harjavalta, Huittinen, Pori, Sastamala, Säkylä and Ulvila. The former neighboring municipalities are Keikyä (later Äetsä), Kiikoinen, Kiukainen, Kullaa, Köyliö and Lavia.

Kokkäki's central town Tulkkila was transformed into a densely populated community in 1923. The municipality of Kauvatsa was annexed to Kokemäki in 1969. The Kokemäki parish, which operated from 1996 to 2007, included the cities of Harjavalta, Huittinen and Kokemäki, as well as the municipalities of Köyliö and Säkylä. The population of the district is 34,898. These same cities and municipalities also belong to the area of ​​the Kokemäki office of the Satakunta Tax Office. The Satakunta Research Station of the Agricultural Research Center operated in the village of Järilä from 1929 to 1996. On December 15, 2008, Kokemäki City Council decided on a municipal alliance with Nakkila, Harjavalta and Ulvila, but the project failed after Ulvila changed its decision.

Due to its central location and old settlement, Kokemäki has been a historically significant central area. Kokemäki has, among other things, antiquities of the Iron Age and the Middle Ages. In the later Middle Ages, the historical province of Satakunta was often called the county of Kokemäenkartano.

The 121-kilometer-long Kokemäenjoki River, named after the locality, flows through the Kokemäki center and the city area. The Kokemäenjoki watershed is the fourth largest in Finland. The Kols hydropower plant is located in the city area.