Suomussalmi is a municipality of Finland.

It is located in the province of Oulu and is part of the Kainuu region. The municipality has a population of 10740 and covers an area of 5856,9 kmē of which 581,66 kmē is water. The population density is 1,9995 inhabitants per kmē.

The municipality is unilingually Finnish.

See also: Municipalities of Oulu