Koshigaya (越谷市 Koshigaya-shi) is a city located in Saitama Prefecture, Japan.
As of 2010, the city has an estimated population of 325,074 and a population density of 5,390 persons per km². The total area is 60.31 km².
The city was founded on November 3, 1958. Koshigaya is situated about 30 km from Tokyo, along the banks of the Motoarakawa River. It is famous for producing daruma.
Koshigaya is served by two train lines: the Tobu Isesaki Line and the JR Musashino Line. These two lines intersect at Minami-Koshigaya Station and Shin-Koshigaya Station, which are located close to each other. The Aeon Laketown shopping mall is located next to Koshigaya-Laketown Station (on the Musashino Line), and Koshigaya City Office is located within walking distance of Koshigaya Station (on the Tobu Skytree Line).
Bunkyo University is located in Koshigaya.
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Sister cities 
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