Hiro Hachiman Jinja (広八幡神社) is a Shinto shrine located in the town of Hirogawa, Wakayama Prefecture, Japan.

This monument with an inscription by Katsu Kaishu and calligraphy Iwaya Ichiroku, was designated a National Historic Site in 2015.

During the rule of the Kii Tokugawa clan, the shrine was supported by Kishū Domain during the Edo period.

With the Meiji restoration and the Separation of Shintoism and Buddhism, the various Buddhist-related structures on the grounds of the shrine were destroyed or relocated.

The shrine's dengaku and lion dance performances during its autumn festival has been designated Wakayama Prefecture Intangible Cultural Properties.