Duke Xi of Qi (Chinese: 齊僖公; pinyin: Qí Xī Gōng; died 698 BC) was from 730 to 698 BC the thirteenth recorded ruler of the State of Qi during the Spring and Autumn period of ancient China. His personal name was Lü Lufu (呂祿甫), ancestral name Jiang (), and Duke Xi was his posthumous title.

Duke Xi succeeded his father Duke Zhuang I of Qi, who died in 731 BC after a reign of 64 years, as ruler of Qi. In 706 BC, Qi was attacked by the Northern Rong tribes (also called Mountain Rong). Duke Zhuang of the State of Zheng sent Crown Prince Hu (later Duke Zhao of Zheng) to help Qi repel the Northern Rong.

Duke Xi reigned for 33 years and died in 698 BC. He was succeeded by his son, Duke Xiang of Qi, who would later be murdered by Duke Xi's nephew Wuzhi. Wuzhi himself was also killed soon afterward, and Duke Xi's younger son Xiaobai ascended the throne, posthumously known as Duke Huan of Qi. Qi grew strong under Duke Huan's rule and he became the first of the Five Hegemons of the Spring and Autumn period.

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