Shuzenji Onsen is a geothermal spring system in the Tagata District of Shizuoka Prefecture, Japan, in the central region of Izu Peninsula.

[4] The historical town that was built up around the geothermal system was also called Shuzenji, however it has since merged into the city of Izu.

Tokko-no-yu is the best known hot spring in the system; it is located between the banks of the Katsura River in the middle of Shuzen town.

A small rustic open-air public bath house has been built above the spring containing an ashiyu or foot spa.

[6] There are numerous commercial spa hotels and historic ryokan in the area, as well as Hakoyu, the public bathhouse.