Duke Dao of Cao (6th century BCE) () was the twenty-second ruler of the vassal State of Cao during the Chinese Spring and Autumn period (770 – 475 BCE).''Rulers of Cáo'' at the ''Chinese Text Project''
/ref> Born as Jī Wŭ (姬午), he was the son of Duke Ping of Cao from whom he inherited the throne from 523 BCE.Liu Jun Ling and Lin Ganhe, ''Timeline of Chinese Historical Families'', Muduo Publishing, Taiwan, 1982. 林干合编，《中国历代各族纪年表》，1982年，台北，木铎出版社 Duke Jing of Song captured Duke Dào in 515 BCE and held him prisoner until his death. Thereafter, disorder broke out in the State of Cáo as Dào’s successors, Duke Sheng of Cao and Duke Yin of Cao, were killed one after the other.

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{{DEFAULTSORT:Dao, Duke of Cao Zhou dynasty people Chinese dukes 6th-century BC Chinese monarchs 6th-century BC births Year of death unknown 515 BC deaths