Kenjin 憲深 (also read Kenshin; 1192–1263) was a Japanese Shingon master of the early Kamakura period, of the Ono-ryū 小野流 lineage transmitted at Ninniku-yama 忍辱山 (Enjō-ji in Yamato). He was a senior disciple of Seizon 成尊 and the central figure of the Ninniku-yama transmission line, the major mid-Kamakura branch of the Ono-ryū. He rose to senior monastic office and was the master of Shinkai 親快 (1205–1271), through whom his oral teachings were preserved.
His sole surviving work in the Kanripo corpus is the five-fascicle KR6t0204 Xìngxīn chāo (Kōshinshō), compiled by Shinkai from Kenjin’s oral teachings. This work is the principal documentary witness to the mid-13th-century Ninniku-yama Ono-ryū.
Surviving work in the Kanripo corpus: KR6t0204 Kōshinshō (5 fasc., with Shinkai as recorder).