Karijoki

Karijoki () is a municipality of Finland.
It is part of the South Ostrobothnia region. The population of Karijoki is (), which makes it the smallest municipality in South Ostrobothnia in terms of population. The municipality covers an area of of which is inland water (). The population density is .
The municipality is unilingually Finnish.
A neanderthal cave, the Wolf cave, was found in the Pyhävuori mountains in Karijoki in 1997.
Villages.
Alakylä, Karijoen kirkonkylä, Myrkky and Ylikylä.