Koide, Niigata

 was a town located in Kitauonuma District, Niigata Prefecture, Japan. It is famous for its snowy ski resort.
As of 2003, the town had an estimated population of 12,735 and a density of 423.93 persons per km². The total area was 30.04 km².
On November 1, 2004, Koide, along with the town of Horinouchi, and the villages of Hirokami, Irihirose, Sumon and Yunotani (all from Kitauonuma District), was merged to create the city of Uonuma.
Climate.
Koide has a humid subtropical climate (Köppen "Cfa") that borders on a humid continental climate, with four distinct seasons. Winters are cool and extremely snowy due to its location in a mountainous valley, while summers are hot and humid.
Transportation.
Railway.
 JR East - Jōetsu Line
 JR East - Tadami Line