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 2,701 (30 June 2015) and covers an area of 253.03 square kilometres (97.70 sq mi) of which 1.66 km (0.64 sq mi) is water. The population density is 10.75 inhabitants per square kilometre (27.8/sq mi). Mayor of Alavieska is Tapani Vierimaa.