Nanzō-in, Buddhist temple in Nerima-ku, Japan

Nanzō-in, formally Rurikōzan Nanzō-in Iō-ji, is a Shingon Buzan-ha temple in Nakamura, Nerima-ku, Tokyo. Its main image is Yakushi Nyorai, the healing Buddha. The grounds hold a main hall, a nagayamon gate, a bell tower gate designated a Nerima City cultural property, a Yakushi hall, an Emma hall, a Fudō hall, Niō statues and the Hikawa Jizō.

Nanzō-in's founding is unknown, but tradition holds that the monk Ryōben Sōzu revived it in 1357 (Enbun 2), and it held a shōen estate of 12 koku 8 to. In the Edo period it distributed the 'Hakuryūgan' medicine, sold nationwide as 'Nanzō-in no nagekomi' until the 1877 drug laws banned it. It is the 15th stop on the Toshima and Gofunai 88-temple pilgrimages.

The temple serves as a place of veneration centered on its enormous bronze figure, which draws many people seeking spiritual connection. Sacred remains placed within the statue represent a meeting point between Buddhist traditions from different regions.

Nanzō-in is a ten-minute walk from either Nerima or Nakamurabashi Station on the Seibu Ikebukuro Line. Keio Bus route 92 from Nakano Station's north exit or Nerima Station also stops at a bus stop named after the temple. The grounds are flat, with the main hall, bell tower gate and halls set close together.

The temple's full name is Rurikōzan Nanzō-in Iō-ji, and its main image is Yakushi Nyorai, the healing Buddha. From the Edo period until 1877 it distributed a medicine called Hakuryūgan, said to cure all illnesses; the practice, known as Nanzō-in no nagekomi, spread nationwide until the drug sales law banned it.