Tetta (哲多町 Tetta-chō) was a town located in Atetsu District, Okayama, Japan.
On March 31, 2005 Tetta, along with the towns of Ōsa, Shingō and Tessei, all from Atetsu District, was merged into the expanded city of Niimi.
As of 2003, the town had an estimated population of 3,961 and a density of 36.89 persons per km². The total area was 107.37 km².