Duke Hui of Qi (Chinese: 齊惠公; pinyin: Qí Huì Gōng; died 599 BC) was from 608 to 599 BC ruler of the State of Qi, a major power during the Spring and Autumn period of ancient China. His personal name was Lü Yuan (呂元), ancestral name Jiang (), and Duke Hui was his posthumous title. He was known as Prince Yuan before ascending the throne.

Duke Hui's father was Duke Huan of Qi, who was the first of the Five Hegemons, the most powerful rulers of the Spring and Autumn period. Duke Huan had at least three main wives who bore no sons, six favoured concubines, and more than ten sons. Duke Hui was then known as Prince Yuan, and his mother was the younger Wey Ji, one of two princesses of the State of Wey who were among Duke Huan's favoured concubines. Five other sons of Duke Huan also contended for the throne: Prince Wukui, Crown Prince Zhao (later Duke Xiao), Prince Pan (later Duke Zhao), Prince Shangren (later Duke Yì), and Prince Yong.

When Duke Huan died in the tenth month of 643 BC, the six princes fought one another for the throne. Wukui, the son of the elder Wey Ji, prevailed at first, but was killed three months later and replaced by Duke Xiao. Duke Xiao died after ten years of reign, and was succeeded by Duke Zhao whose supporters killed Duke Xiao's son. When Duke Zhao died in 613 BC, his son She ascended the throne, but was soon murdered by his uncle Duke Yì.

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