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Ruukki is a former municipality of Finland.

It is located in the province of Oulu and is part of the Northern Ostrobothnia region. The municipality had a population of 4,505 (31 December 2006) and covered an area of of which is water. The population density was .

The municipality was unilingually Finnish.

In 2007 municipality of Ruukki joined together with Siikajoki.