Duke Mu of Qin

Renhao 任好
Duke Mu of Qin
Ruler of Qin
Reign	659–621 BC
Predecessor	Duke Cheng of Qin
Successor	Duke Kang of Qin
Died	621 BC
House	House of Ying
Father	Duke De of Qin

Duke Mu of Qin (Chinese: 秦穆公; pinyin: Qín Mù Gōng, died 621 BC) was from 659 to 621 BC the fourteenth ruler of the Zhou Dynasty State of Qin. His ancestral name was Ying (), given name Renhao (任好), and Duke Mu was his posthumous title. Sometimes considered one of the Five Hegemons of the Spring and Autumn period, he greatly expanded the territory of Qin during the reign of King Xiang of Zhou.

He acquired many talented advisors, such as Baili Xi, Jian Shu (蹇叔), Pi Bao (丕豹), and Gong Sun (公孫).

He was the son of Duke De of Qin and the younger brother of Duke Cheng. He married Mu Ji (), the daughter of Duke Xian of Jin, and married his daughter Huai Ying (懷嬴) to two of Duke Xian's sons. He helped his son-in-law win the Battle of Chengpu against Chu; these two marriages led to the saying "the Friendship of Qin and Jin" (秦晉之好) to denote political marriages and alliances based on marital bonds.

He had at least two sons: Ying and Hong. Ying succeeded him as Duke Kang of Qin. He also had several known daughters: Huai Ying (wife of Dukes Huai and Wen of Jin), Wen Ying (wife of Duke Wen of Jin), Qin Ying (wife of King Gong of Chu), Jianbi, and Nongyu (wife of Xiao Shi). There are doubts as to whether Huai Ying and Wen Ying were different names for the same daughter; likewise, some argue for the conflation of Jianbi and Nongyu.

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