Somero (Finnish pronunciation: [ˈsomero]) is a town and municipality of Finland. It is part of the Southwest Finland region in the province of Western Finland, located 36 kilometres (22 mi) northeast of Salo, 86 kilometres (53 mi) east of Turku and 105 kilometres (65 mi) northwest of Helsinki. The municipality has a population of 8,339 (31 December 2025) and covers an area of 697.67 square kilometres (269.37 sq mi) of which 29.9 km2 (11.5 sq mi) is water. The population density is 12.48 inhabitants per square kilometre (32.3/sq mi). Somero is unilingually Finnish.
Somero's neighbouring municipalities are Jokioinen, Koski Tl, Lohja, Loimaa, Salo, Tammela and Ypäjä.
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