Ōsa, Okayama

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Ōsa (大佐町 Ōsa-chō?) was a town located in Atetsu District, Okayama Prefecture, Japan.

As of 2003, the town had an estimated population of 3,922 and a density of 32.35 persons per km². The total area was 121.25 km².

On March 31, 2005, Ōsa, along with the towns of Shingō, Tessei and Tetta (all from Atetsu District), was merged into the expanded city of Niimi.