Oulujoki (Swedish: Ule älv) is a river in Oulu province, Finland. Its name in Finnish literally means "Oulu River", originally in old Northern Ostrobothnian dialect literally "Flood River". Its origin is Oulujärvi, and its watershed area covers a significant part of Kainuu region. It flows into the Bothnian Bay at Oulu. Port of Oulu is located at the mouth of the river.

• Media related to Oulujoki at Wikimedia Commons