Pyhäjärvi (1993–1995 Pyhäsalmi) is a town and municipality in the south of Northern Ostrobothnia region, Finland. As the highway 4 (E75), the highway 27 and the Ylivieska–Iisalmi railway all run through the town, Pyhäjärvi is well situated in an intersection of communication and transport services. The town has also an airfield.
Pyhäjärvi contains Europe's deepest mine, the 1,444 meters (4,738 ft) deep Pyhäsalmi Mine from where zinc and copper is mined
