Prince Joyi
| Prince Joyi | |
| Hangul | 조이군 |
|---|---|
| Hanja | 助伊君 |
| Revised Romanization | Joigun |
| McCune–Reischauer | Choigun |
Prince Joyi (Korean: 조이군; Hanja: 助伊君) was a Korean Royal Prince as the fourth and youngest son of Taejo of Goryeo and Queen Jeongdeok. He was a Buddhism.