Yokei-ji, Buddhist temple in Setouchi, Japan.

Yokei-ji is a Tendai Buddhist temple on Uetera-san in Kitajima, Oku-chō, Setouchi, Okayama Prefecture. Its main hall, rebuilt in 1714, is an irimoya-zukuri structure with hongawara tiles. The grounds also hold a 1815 three-story pagoda, a bell tower rebuilt in 1850, and six surviving sub-temples, including Keiryō-in and Honjō-in.

Founded in 749 by the monk Hōon, the temple was first called Nichijisan Nichirin-ji. It declined, was revived by Ennin in the Heian period as Honkaku-ji, became a prayer temple of Emperor Konoe, and burned during the Genpei War. In the Muromachi period it took the name Yokei-ji and was later protected by the Urakami, Ukita and Ikeda families.

Locals usually call the temple Uetera-san or Uetera after its mountain name, Uetera-zan. It is the second stop on the Chugoku 33 Kannon pilgrimage and the sixteenth on the Sanyo Hana no Tera route. The temple keeps a gosho-ka poem: 'kenyaku ni mi o tsutsushimite ogori naku tada yoki koto o sureba yokeiji.'

The temple is a 20-minute walk from JR Oho Station on the Ako Line, or 15 minutes from the Uetera bus stop. By car, it is about 5 minutes east of the Saidaiji IC or west of the Setouchi IC on the Okayama Blue Line. The grounds are lit up at year-end and New Year.

The temple bell, cast around 1571, was originally donated to a Christian church in Bungo Province; in 1587 Ukita Hideie gave it to Yokei-ji, and it is now an Okayama Prefecture Important Cultural Property. The main image, a hidden Thousand-Armed Kannon, is shown only once every 33 years, most recently in November 2012.