Jōhoku (常北町; -machi) was a town located in Higashiibaraki District, Ibaraki, Japan.
On February 1, 2005 Jōhoku was merged with the village of Katsura, also from Higashiibaraki District, and the village of Nanakai, from Nishiibaraki District, to form the new town of Shirosato and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 13,575 and a density of 259.26 persons per km². The total area was 52.36 km².