Jūou (十王町; -machi) was a town located in Taga District, Ibaraki, Japan.
On November 1, 2004 Jūō was merged into the expanded city of Hitachi and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 13,373 and a density of 185.43 persons per km². The total area was 72.12 km².