Echin 惠鎭 (1281–1356), also known by his personal name Enkan 圓觀, was a Tendai master and political-religious figure of the late Kamakura and Nanboku-chō periods. He served as Hosshō-ji zasu 法勝寺座主 and as abbot of Gennō-ji 元應寺 — the Tendai temple in the imperial capital (Kyoto) established in 1319 by Emperor Hanazono 花園 and Empress Eifukumon-in 永福門院 as a state-protection institution. He was the personal Tendai precept-master to Emperor Go-Daigo 後醍醐天皇 (1288–1339) and is recorded in the Taiheiki 太平記 as one of the principal Buddhist participants in the Genkō Incident (元弘の變, 1331–1333) — the Go-Daigo–led plot to overthrow the Hōjō regency, in which Echin and his disciples performed fudō esoteric rites against the Bakufu.
Echin’s doctrinal teaching is rooted in the Tendai-Esoteric (Taimitsu 台密) synthesis developed by Ennin and Annen (圓仁, 安然), and he is associated in the medieval Tendai lineage records with the yuánmì (round-and-esoteric) doctrinal framework. His KR6t0071 Yuánmìzōng èrjiào míngmù is a single-fascicle catechetic nomenclature manual for the yuánmì tradition.
Beyond doctrinal works, Echin is also remembered for his role in the medieval imperial Tendai patronage system and for his patronage of major Hiei-zan reconstruction efforts during the politically turbulent Kenmu-Restoration and early Nanboku-chō decades. He survived the political collapse of the Go-Daigo regime and died in 1356 at 76.
Within the Kanripo corpus his preserved work is KR6t0071 Yuánmìzōng èrjiào míngmù.