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| Yi Ku | |
|---|---|
 Yi as a child | |
| Head of the House of Yi | |
| Period | May 1, 1970 – July 16, 2005 |
| Predecessor | Crown Prince Yi Un |
| Successor | Yi Won or Yi Seok (disputed) |
| Born | December 29, 1931 Kitashirakawa Palace (now former Grand Prince Hotel Akasaka), Kioicho, Kojimachiku, Tokyo, Empire of Japan |
| Died | July 16, 2005 (aged 73) Grand Prince Hotel Akasaka, Kioicho, Kojimachiku, Tokyo, Japan |
| Spouse | |
| Issue | Eugenia Unsuk (adopted) |
| House | Yi |
| Father | Crown Prince Yi Un of Korea |
| Mother | Princess Masako of Nashimoto of Japan |
| Religion | Roman Catholicism |
| Occupation | Architect, businessperson |
| Yi Ku | |
| Hangul | 이구 |
|---|---|
| Hanja | 李玖 |
| Revised Romanization | I Gu |
| McCune–Reischauer | I Ku |
| Imperial title | |
| Hangul | 황세손 |
| Hanja | 皇世孫 |
| Revised Romanization | Hwangseson[note 1] |
| McCune–Reischauer | Hwangseson |
| Posthumous title | |
| Hangul | 회은황세손 |
| Hanja | |
| Revised Romanization | Hoeeun Hwangseson[note 2] |
| McCune–Reischauer | Hoeŭn Hwangseson |
Yi Ku (Korean: 이구; December 29, 1931 – July 16, 2005) was a Korean prince who was head of the House of Yi from 1970 until 2005. He was a grandson of Emperor Gojong of the Joseon dynasty. Through Kuni Asahiko his maternal great-grandfather, Ku was a second-cousin to Emperor Emeritus Akihito of Japan.