Duke Cheng of Qin (Chinese: 秦成公; pinyin: Qín Chéng Gōng; died 660 BC), personal name unknown, was from 663 to 660 BC the duke of the Qin state.
Duke Cheng was the second of the three sons of his father Duke De. His older brother Duke Xuan succeeded his father as ruler of Qin in 676 BC. However, when Duke Xuan died in 664 BC, he passed the throne to Duke Cheng instead of one of his nine sons. When Duke Cheng died four years later, he did the same and passed the throne to the third brother Duke Mu, even though he had seven sons.
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