Yamanashi Prefecture (撅望◢??Yamanashi-ken) is a prefecture of Japan located in the Ch贖bu region of the main island of Honshu.

The prefecture is landlocked, and features a fertile central valley, the K?fu Basin, surrounded by many of the highest mountains in Japan including the highest, Mount Fuji located on the southern border with Shizuoka. Kofu Basin, Kofu City and view of Mt. Fuji.

The capital of the prefecture is the city of K?fu.