Saijō (西城町, Saijō-chō) was a town located in Hiba District, Hiroshima Prefecture, Japan. The site of a feudal castle from the Sengoku period, it was first incorporated as a town in 1898. It then went through several mergers with other towns and villages in the area before being incorporated itself into the city of Shōbara in March 2005. It is now a municipal division within Shōbara.