Xi Xiaobo (1910–1977) was a Peking opera singer.
Xi was best known for his "old man" roles (老生, lǎoshēng) and was considered one of Peking Opera's "Four Great Beards" (t 四大鬚生, s 四大须生, p Sì Dà Xūshēng), along with Tan Fuying, Yang Baosen, and Ma Lianliang.
He served as a mentor to Li Yuru.
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