| Yi Hyeon-il | |
| Hangul: | 이현일 |
| Rr: | Lee Hyeonil |
| Mr: | Lee Hyŏnil |
Yi Hyeon-il - 이현일 - 李玄逸 (1627–1704) was a scholar-official of the Joseon period of Korea. His pen name was Ikseung (익승,翼昇), his nickname was Garam (갈암,葛庵) and his posthumous name was Mungyeong (문경, 文敬).He led the Toegye school during the reign of King Sukjong and was a prominent Namin.
Due to political turmoil and factional strife, he had to suffer a succession of dismissals and reinstatements, even after his death.For this reason, the publication of his collected papers, the GaramJib, was ever and ever delayed and only occurred in the 1910s.