Ruukki

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 772.58 km2 of which 5.79 km2 is water. The population density was 5.88 PD/km2.

The municipality was unilingually Finnish.

In 2007 municipality of Ruukki joined together with Siikajoki.