Seto (瀬戸町 Seto-chō) was a town located in Akaiwa District, Okayama, Japan.
On January 22, 2007 Seto, along with town of Takebe, from Mitsu District, was merged into the expanded city of Okayama.
As of 2003, the town had an estimated population of 14,794 and a density of 354.09 persons per km². The total area was 41.78 km².