Duke Yì of Qi (Chinese: 齊懿公; pinyin: Qí Yì Gōng; died 609 BC) was from 612 to 609 BC ruler of the State of Qi, a major power during the Spring and Autumn period of ancient China. His personal name was Lü Shangren (呂商人), ancestral name Jiang (姜), and Duke Yì was his posthumous title.