Mitsu District, Okayama

Mitsu District (御津郡, Mitsu-gun^?) was a district located in Okayama Prefecture, Japan.

As of 2003, the district had an estimated population of 22,923. The total area was 345.10 km².

On April 1, 1900, the district was founded after the mergers of Mino and Tsudaka Districts.

Due to the mergers, the following towns have been dissolved since the 1970s.