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Kalajoki
Location
CountryFinland
Physical characteristics
Source 
 • locationLake Reisjärvi, Reisjärvi, Finland
Mouth 
 • location
Bothnian Bay in Kalajoki, Finland
 • coordinates
64°16′14″N 023°55′22″E / 64.27056°N 23.92278°E / 64.27056; 23.92278
Length130 km (81 mi)
Basin size4,247 km2 (1,640 sq mi)

The Kalajoki (literally "Fish River") is a 130-kilometre (80 mi) long river in Northern Ostrobothnia, Finland. The river's origin is near Haapajärvi and its mouth is in Kalajoki municipality where the river flows into the Baltic Sea.