Gwangjong of Goryeo (Korean: 고려 광종; Hanja: 高麗光宗, 925–975) was a Korean ruler. His real name was Wang So (왕소, 王昭), and his Chinese style name was Ilhwa (일화 日華). He was the 4th King and Emperor of the Goryeo Dynasty from 947 to 975.