Duke Cheng of Qi (齊成公 Qí Chéng Gōng; died 795 BC) was from 803 to 795 BC the eleventh recorded ruler of the State of Qi during the Western Zhou Dynasty of ancient China. His personal name was Lü Yue (呂說), ancestral name Jiang (姜), and Duke Cheng was his posthumous title.

Duke Cheng succeeded his father Duke Wen of Qi, who died in 804 BC, as ruler of Qi. He reigned for 9 years and died in 795 BC. He was succeeded by his son, Duke Zhuang I of Qi.

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齊成公（？ - 前795年），姜姓，名脫（一作說），齊文公之子。《史記》對他無太多記載，周宣王三十三年（前795年），成公在位九年卒，子公子購立。