Mimasaka, Okayama (town)

 was a town located in Aida District, Okayama Prefecture, Japan.
As of October 2004, the town had an estimated population of 12,856 and a density of 147.82 persons per km². The total area was 86.97 km².
On March 31, 2005, Mimasaka absorbed the towns of Aida, Ōhara and Sakutō, the village of Higashiawakura (all from Aida District), and the town of Katsuta (from Katsuta District) to create the city of Mimasaka.