was a district located in Ōita Prefecture, Japan.
As of 2003, the district had an estimated population of 10,956 and the density of 39.58 persons per km<sup>2</sup>. The total area was 276.84 km<sup>2</sup>.
Former towns and villages
- Kujū
- Naoiri
- Ogi
District Timeline
- On April 1, 2005 - the towns of Kujū, Naoiri and Ogi were merged into the expanded city of Taketa. Therefore, Naoiri District was dissolved as a result of this merger.