Hyrynsalmi is a municipality in Finland and part of the Kainuu region. It is located in the country's east-central interior, within a region characterised by extensive forests, hills and numerous lakes.
Like other municipalities in Kainuu, Hyrynsalmi is sparsely populated, with settlement concentrated in the municipal centre and a scattering of smaller villages across a large rural area. The surrounding landscape of woodland and waterways reflects the broader natural setting of the region.