thumb|Location of Tsukubo District in Okayama Prefecture
is a district located in Okayama Prefecture, Japan.
As of 2003, the district has an estimated population of 21,601 and a population density of 789.80 persons per km<sup>2</sup>. The total area is 27.35 km<sup>2</sup>.
Towns and villages
- Hayashima
Merger
- On March 22, 2005, the villages of Yamate and Kiyone merged into the city of Sōja.