Alajärvi (Finnish pronunciation: [ˈɑlɑˌjærʋi]; lit. 'lower lake') is a town and municipality of Finland. It is located in the South Ostrobothnia region. The town has a population of 8,982 (31 December 2025) and covers an area of 1,056.74 square kilometres (408.01 sq mi) of which 47.99 km2 (18.53 sq mi) is water. The population density is 8.9 inhabitants per square kilometre (23/sq mi). The town is unilingually Finnish.
The municipality of Lehtimäki was consolidated with Alajärvi on 1 January 2009.
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