Chan Siu-bak (???) (20 July 1869 – 23 December 1934), born Chan Siu-man (???), courtesy name Siu-bak (??), art-named Kwai-shek (??), was a Chinese revolutionary from Sanwui, Kwangtung.
He was one of the Four Bandits, together with Sun Yat-sen, Yau Lit and Yeung Hok-ling.