Izusan Jinja (伊豆山神社) is a Shinto shrine in the city of Atami in Shizuoka Prefecture, Japan.

The primary kami of Izusan Jinja is the Izu Daigongen (伊豆大権現), an amalgamation of Honomusuhi-no-mikoto (火牟須比命), Izanagi (伊邪那伎命) and his consort Izanami (伊邪那美命) The volcanic springs and a geyser at Atami were regarded in ancient Japan as manifestations of the kami, and ancient records indicate that a shrine already existed here by 594 AD.

After he was exiled to Izu, Minamoto no Yoritomo worshipped at Izusan Shrine for divine assistance in his struggle to overthrow the Heike clan in the Genpei War.

Yoritomo and Masako later had the shrine rebuilt on a large scale, and its holdings extended as far as Echigo Province.

Most of the shrine records and many of its structures were lost in the destruction of the shinbutsu bunri movement following the Meiji Restoration.