Eurajoki (; ) is a municipality of Finland located in the region of Satakunta in the province of Western Finland. The municipality has a population of () and covers an area of of which is water. The population density is .
The municipality is unilingually Finnish.
Three of Finland's five nuclear reactors are on the island of Olkiluoto in Eurajoki, and a fourth one is planned since 2008. The two other operating reactors are at the Loviisa Nuclear Power Plant.
Site-preparation for the construction of the Onkalo spent nuclear fuel repository, a deep geological repository for spent nuclear fuel, is going on (as of Q4 2022). The site will be a permanent facility for spent-fuel storage.
The distance from the church village of Eurajoki to the nearest town, Rauma, is , and to the nearest city, Pori, is . Highway 8 (E8) and the railway between Kokemäki and Rauma run through the municipality.
Results of the 2011 Finnish parliamentary election in Eurajoki: