Mitsu (御津町 Mitsu-chō ) was a town located in Mitsu District, Okayama, Japan.
On March 22, 2005 Mitsu, along with the town of Nadasaki, from Kojima District, was merged into the expanded city of Okayama.
As of 2003, the town had an estimated population of 10,124 and a density of 88.48 persons per km². The total area was 114.42 km².