Kabocha is a type of winter squash, a Japanese variety of the species Kabocha. It is also called kabocha squash or Japanese pumpkin in North America. In Japan, "kabocha" may refer to either this squash, to the Western pumpkin, or indeed to other squashes.
Many of the kabocha in the market are kuri kabocha, a type created from seiyo kabocha (buttercup squash). Varieties of kabocha include Ajihei, Ajihei No. 107, Ajihei No. 331, Ajihei No. 335, Cutie, Ebisu, Emiguri, Marron d'Or and Miyako.