is a district located in Fukui Prefecture, Japan.
As of 2003, the district had an estimated population of 18,680 with a density of 133.18 persons per km<sup>2</sup>. The total area is 140.26 km<sup>2</sup>.
Municipalities
The district consists of two towns:
- Ōi
- Takahama
;Notes:
History
thumb|320px|right|Map showing original extent of Ōi District in [[Fukui Prefecture:<br /><br />* yellow - areas formerly within the district borders during the early Meiji period<br /> ]]
260px|thumb|right|Colored areas are in this district.
District Timeline
Recent mergers
- On March 3, 2006 - The village of Natashō (from Onyū District) was merged into the expanded town of Ōi.
