Alavieska is a municipality of Finland. It is located in the province of Oulu and is part of the Northern Ostrobothnia region. The municipality has a population of 2,384 and covers an area of 253.02 square kilometres (97.69 sq mi) of which 1.66 km2 (0.64 sq mi) is water. The population density is 9.48 inhabitants per square kilometre (24.6/sq mi).