right|thumb|300px|Map of Niwa District in Aichi Prefecture
is a district located in northwestern Aichi Prefecture, Japan.
As of October 1, 2019, the district had an estimated population of 58,304 with a density of 2,351 persons per km<sup>2</sup>. The total area is 24.79 km<sup>2</sup>.
Municipalities
The district consists of two towns:
- Fusō
- Ōguchi
;Notes:
History
thumb|320px|right|Map showing original extent of Niwa District in [[Aichi 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.