Kalajoki (Finnish pronunciation: [ˈkɑlɑˌjoki]; literally translated the "fish river") is a coastal town and municipality of Finland. It is located in the immediate vicinity of the Gulf of Bothnia in the province of Oulu and is part of the Northern Ostrobothnia region.
The town has a population of 12,296 (31 August 2024) and covers an area of 2,391.30 square kilometres (923.29 sq mi) of which 1,469.15 km2 (567.24 sq mi) is water. The population density is 13.31 inhabitants per square kilometre (34.5/sq mi).
The municipality is unilingually Finnish.