Koshigaya Bairin Park, Urban park in Koshigaya, Japan.

Koshigaya Bairin Park is a 2.56-hectare urban park on the left bank of the Motoara River in Koshigaya, Saitama. It holds about 240 plum trees, including white, red, Shirokaga and Okushirokaga varieties, plus a sample orchard of 33 types and 66 trees. The grounds also contain a children's plaza, a lawn plaza, a gateball court and two azumaya shelters.

Plum growing replaced peach orchards around 1955 in the Obayashi and Obusa districts, but housing spread as the population grew. In February 1987 a housing plan for the remaining plum grove led Koshigaya to buy the land, and the park opened in February 1988. A 2022 ordinance revision made it a neighbourhood park under the Urban Park Act.

The site hosts an annual plum blossom festival in March, where visitors witness traditional tea ceremonies and local vendors selling food and crafts beneath the flowering trees. This celebration brings together people wanting to experience both nature and local traditions.

The park is open around the clock and free to enter, with two toilet blocks, two azumaya shelters and benches. There are 10 parking spaces, which may be unavailable during events. From Tobu Isesaki Line Kita-Koshigaya Station west exit it is about a 20-minute walk; by car, leave Route 4 at the Motohara River bridge junction.

The site features a dedicated section with numerous plum varieties that allows visitors to study and compare the distinct characteristics of each type. This rare offering in urban settings draws both gardening enthusiasts and curious travelers.