Fuefuki is a city situated in Yamanashi Prefecture, Japan, positioned in the central part of the region at an average altitude of 261 meters. The municipality covers a total area of 201.92 square kilometres, with just over 58 percent of its land covered by forest. The Fuefuki River flows through the city, giving it its name and serving as a central geographical feature within this mountainous prefecture.

The area served as the center of ancient Kai Province and contains numerous burial mounds from the Kofun period, alongside the ruins of the Nara period provincial temple, Kai Kokubun-ji. During the Edo period, the region was tenryō territory under the Tokugawa shogunate. The modern city was established on October 12, 2004, through the merger of several towns and villages, later absorbing Ashigawa village in 2006.

The city hall is located at the former Isawa Town Hall, with other former administrative centers converted into satellite offices. Notable heritage sites include Ichinomiya Asama Shrine, the ichinomiya of Kai Province, and the Yamanashi Prefectural Museum. The Shakado Museum of Jomon Culture also resides within the city limits, preserving the rich archaeological history of the region.

Fuefuki is renowned for its agricultural output, particularly as Japan's largest producer of grapes and peaches, supporting a local economy based on horticulture and wine production. Seasonal tourism draws visitors to the area, which also inspired the fictional town of Inaba in the 2008 video game Persona 4. The city maintains sister city relationships with locations in Germany, France, China, and several Japanese prefectures.

As of 1 September 2020, the city had an estimated population of 67,300 in 30,408 households, with a density of 340 persons per square kilometre. The climate features hot, humid summers and mild winters, with an average annual temperature of 10.7 °C. Access is provided by the Chūō Main Line railway and several national routes, including National Route 20.