Ojiya (小千谷市; -shi) is a city located in Niigata, Japan.
As of 2003, the city has an estimated population of 40,883 and a density of 263.56 persons per km². The total area is 155.12 km².
The city was founded on March 10, 1954.
On October 23, 2004, the Chuetsu Earthquake struck Ojiya, causing shaking measured at shindo 6+ and causing fatalities. Electricity was lost 3 days after the earthquake.
