Saijō (西城町 Saijō-chō) was a town located in Hiba District, Hiroshima, Japan.
On March 31, 2005 Saijō, along with the towns of Hiwa, Kuchiwa, Takano and Tōjō, all from Hiba District, and the town of Sōryō, from Kōnu District, was merged into the expanded city of Shōbara.
As of March 2011, the town had a population of 4,182 and a density of 18.43 persons per km². The total area was 226.91 km².