was a district located in Ōita Prefecture, Japan.
Population
As of 2003, the district had an estimated population of 17,827 with a density of 40.98 persons per km<sup>2</sup>. The total area was 435.03 km<sup>2</sup>.
Towns and villages
- Hon'yabakei
- Sankō
- Yabakei
- Yamakuni
Mergers
- On March 1, 2005 - the towns of Hon'yabakei, Yabakei and Yamakuni, and the village of Sankō were merged into the expanded city of Nakatsu. Shimoge District was dissolved as a result of this merger.