Duke Huai of Qin (Chinese: 秦懷公; pinyin: Qín Huái Gōng; died 425 BC), personal name unknown, was from 428 to 425 BC the duke of the Qin state.^[1][2]

Duke Huai was the younger son of Duke Ligong, who died in 443 BC and was succeeded by Duke Zao, Duke Huai's older brother. When Duke Zao died in 429 BC, Duke Huai was exiled in the Jin state. He returned to Qin and took the throne.^[1][2]

In 425 BC, the fourth year of Duke Huai's reign, Qin general Chao (鼌) and other ministers rebelled against Duke Huai. Duke Huai was besieged and committed suicide. As his son Crown Prince Zhaozi (昭子) died early, the ministers installed Zhaozi's son Duke Ling on the throne. Duke Huai also had a younger son, later known as Duke Jian, who would succeed Duke Ling as the 26th ruler of Qin.^[1][2]