Isawa Hachiman Jinja, Shinto shrine in Japan

Isawa Hachiman Jinja stands in the Isawa-chō Ichibu district of Fuefuki, on flat land between the Fuefuki and Ukai rivers at the northern edge of the Kappu basin. It is a former village shrine (mura-sha), also called Kokuga Hachiman-gū in the Kai Kokushi. Its three enshrined deities are Amatarashihiko Kunioshihito no Mikoto, Himei Ōkami and Wakakiniirihiko no Mikoto.

According to the Kai Province shrine and temple records, the shrine received the title Mononobe Shrine in the 5th year of Emperor Seimu's reign and was favored by the imperial court. In the Kamakura period, Takeda Nobumitsu (Isawa Goro) of the Kai Genji invited the Tsurugaoka Hachimangu from Kamakura. In 1525 Takeda Nobutora had it carried to his new capital, founding Fuchu Hachimangu; in 1561 it was among ten shrines exempted from duty at that shrine. After the Takeda fell in 1582, Oda Nobunaga's forces burned its halls and treasures and confiscated its lands, until Tokugawa Ieyasu restored the estate.

The shrine's three deities are Amatarashihikokunioshihito-no-mikoto, Himei-ōkami and Wakakinīrihiko-no-mikoto; it became a Hachiman shrine under the Takeda, who venerated Hachiman as the Minamoto clan deity. A water-safety rite, the suinan-yoke shinji, is held every year on 3 April.

The shrine stands in Isawa-machi Ichibu, Fuefuki, in the northern edge of the Kofu basin, bounded by the Fuefuki and Ukai rivers. The site lies in the area of the former Isawa-shuku post town on the Koshu and Kamakura roads, where the Isawa daikansho was also placed. The annual mizu-nan-yoke shinji, a rite against water disasters, is held on 3 April.

The shrine's three deities are Amatarashihiko Kunioshihito no Mikoto, Himei Okami and Wakakinii rihiko no Mikoto, not Hachiman alone. The shrine is also called Kokuga Hachimangu in the Edo-period gazetteer Kai Kokushi. A water-safety rite, the suinan-yoke shinji, is held every year on 3 April.