thumb|320px|right|Map showing original extent of Santō District in [[Niigata Prefecture:<br /><br />* yellow - areas formerly within the district borders during the early Meiji period<br />* green - current borders<br /> ]]
is a district located in Niigata Prefecture, Japan.
As of July 1, 2019, the district has an estimated population of 4,190 with a density of 94.4 persons per km<sup>2</sup>. The total area is 44.38 km<sup>2</sup>.
Municipalities
The district consists of only one town:
- Izumozaki
History
- Before the Edo Period, Santō District was part of the now-defunct Koshi District.
District timeline
Recent mergers
- On April 1, 2005 - The towns of Koshiji and Mishima were merged into the expanded city of Nagaoka.
- On January 1, 2006 - The towns of Teradomari and Yoita, and the village of Washima were also merged into the expanded city of Nagaoka.