Mid-Joseon civil official and merit subject who led the Injo Restoration coup

| Life | 1557 ~ 1633 |
| Era | 조선 |
| Clan | 연안 이씨 |
His courtesy name was Ogyeo and his pen name Mukjae. A disciple of Yi I and Seong Hon, during the Imjin War he worked to procure military provisions and support the righteous armies.
In 1623, together with Kim Yu, Choe Myeong-gil, and others, he led the Injo Restoration coup that overthrew Prince Gwanghae and enthroned Prince Neungyang (King Injo), for which he was enrolled as a first-class Jeongsa merit subject and enfeoffed as Lord of Yeonpyeong (Yeonpyeong Buwongun). He later served as Minister of Personnel and second vice-chancellor (jwachanseong).
He actively engaged in practical politics, submitting many memorials on national defense and reform.
His son Yi Si-baek rose to chief state councillor, and Yi Si-bang also served as a minister.