Duke Huan of Qi (; died 643 BC) was a powerful Hegemon, who rose to be a major regional power from his headquarters in the State of Qi, toward the end of the early phase of the Spring and Autumn Period of ancient China, which began after the sack of the Western Zhou capital in BCE 771, and ended with his death. He is listed as one of the "Five Hegemons". His ancestral name was Jiang (姜), clan name Lǚ (呂), and given name Xiǎobái (小白).