Utajärvi 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 2,911 (30 June 2015) and covers an area of 1,736.70 square kilometres (670.54 sq mi) of which 65.55 km (25.31 sq mi) is water. The population density is 1.74 inhabitants per square kilometre (4.5/sq mi). The municipality is unilingually Finnish.