Mynämäki is a municipality in the Southwest Finland region of Finland. It is situated in the southwestern part of the country, within the province known for its coastal and agricultural landscapes.
The municipality shares borders with several other Finnish municipalities: Aura, Eura, Laitila, Masku, Nousiainen, Pöytyä, Rusko, Taivassalo, Turku, and Vehmaa. Its position among these neighbouring areas places it within the broader network of communities that make up the Southwest Finland region.
As a municipality of Finland, Mynämäki forms part of the country's local administrative structure. The region of Southwest Finland is one of Finland's nineteen regions, located in the southwestern corner of the country.