Eisan-ji Temple, Buddhist temple in Gojō, Japan

Eisanji is a Shingon temple in Gojō whose main surviving Nara-period building is the octagonal Hakkaku-dō, built between 760 and 764 as a memorial to Fujiwara no Muchimaro. The hall has four doors and four latticed windows, and its interior pillars and beams carry faded paintings of musicians, flying figures and birds. The Hondō, rebuilt in 1553, houses a seated Yakushi Buddha and a stone lantern dated 1284 stands before it.

Tradition holds that Fujiwara no Muchimaro founded the temple as Sakiyama-dera in 719; it later took the name Eisan-ji and became a Fujiwara Southern House family temple. Muchimaro's son Nakamaro built the octagonal hall between 760 and 764 as a memorial to his father, whose remains were moved in 760 to the hill north of the temple. In the Nanboku-chō period three Southern Court emperors stayed here, and the site is designated a national historic site.

The temple bell, cast in 917, is one of the "Three Excellent Bells of the Heian Period" alongside those of Jingō-ji in Kyoto and Byōdō-in in Uji. Its four sides bear a cast inscription composed by Sugawara no Michizane, traditionally attributed to the calligraphy of Ono no Michifune. It was donated by Fujiwara no Dōmyō, a fifth-generation descendant of Muchimaro, and his uncle Tachibana no Sumikiyo, and first hung at Dōshō-ji in Kyoto.

The temple stands in Ojima-chō, Gojō, above the Yoshino River. Buses from JR Gojō Station or the Gojō bus centre run to the Eisanji-mae stop, but departures are few and only on weekdays; alternatively get off at Eisanji-guchi and walk about ten minutes south from the Imai-chō crossing. The main hall displays its Yakushi Buddha only for ten days in spring and ten in autumn.

The octagonal pagoda was recognized as a National Treasure of Japan and is known for its symmetrical form alternating between doors and windows. This balanced design is an uncommon feature in Japanese temple architecture.