Pi is the Mandarin pinyin romanization of the Chinese surname written in Chinese character. It is romanized P'i in Wade–Giles, and Pei in Cantonese. Pi is listed 85th in the Song dynasty classic text Hundred Family Surnames. According to a 2008 study, it was not among the 300 most common surnames in China. However a 2013 study found that it was the 279th most common name, being shared by 229,000 people or 0.017% of the population, with the province with the most people being Hunan.

The same surname is also a Korean family name (), shared by 6,578 people in South Korea in 2015.

Notable people Rixiu (ca. 834–883), classical poet Pi Guangye (877–943), chancellor of the Wuyue Kingdom Pi Xirui (皮錫瑞; 1850–1908), Confucianist Pi Zongshi (1887–1967), President of Hunan University Ignatius Pi Shushi (1897–1978), archbishop of the Roman Catholic Archdiocese of Shenyang Pi Dingjun (皮定钧; 1914–1976), PLA lieutenant general So-Young Pi (born 1946), South Korean physicist Pi Hongyan (born 1979), Chinese-born French badminton player

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