Suda Koi Farm is a koi breeder in Ojiya-city in the Niigata region of Japan. They are one of the few farms in Japan that breed longfin or butterfly koi. They mainly specialize in Ginrin varieties of koi, such as Kohaku, Sanke, Showa, Hikarimono, Kumonryu, and Gosanke. The farm is currently run by Atsushi Suda.