- "Soja" redirects here. For other uses, see Soja (disambiguation).
Sōja (総社市 Sōja-shi) is a city located in Okayama Prefecture, Japan.
As of April 30, 2011, the city has an estimated population of 67,357, with 24,623 households and a population density of 317.72 persons per km². The total area is 212.00 km².
In the 7th century, Ki Castle was built atop the mountain, Kijōyama. Long in ruins, excavation and partial reconstruction began in 1999.
The city was founded on March 31, 1954.
On March 22, 2005, the villages of Yamate and Kiyone (both from Tsukubo District) were merged into Sōja.
Sōja is surrounded by the following cities and towns, all within Okayama Prefecture.
Sōja has been twinned with Chino, Nagano in Japan since 1984.