Duke Jian of Qin (Chinese: 秦簡公; pinyin: Qín Jiǎn Gōng; 428–400 BC), personal name Ying Daozi, was from 414 to 400 BC the duke of the Qin state.
[1][2] Duke Jian was the younger son of Duke Huai and the uncle of his predecessor Duke Ling.
[1][2] During Duke Jian's reign, the Qin state was defeated several times by the Wei state, then a major power of the Warring States period.
[3] Duke Jian reigned for 15 years and died in 400 BC, aged 28.
He was succeeded by his son, Duke Hui II.