Gordon Liu Chia-hui (born Sin Kam-hei, August 22, 1951) is a retired Hong Kong actor, martial artist, and filmmaker, best known for his roles in martial arts films. He was one of the biggest male stars of Shaw Brothers Studio's martial arts cinema during the 1970s and 1980s.

Born in Guangdong, Liu studied Hung Ga kung fu at the school founded by Lau Kar-leung's father, Lau Cham. He entered the Hong Kong film industry as a stuntman. His early acting credits include minor roles in several Hong Kong kung fu films, including the Shaw Brothers-produced 5 Shaolin Masters (1974). He went on to appear in many Shaw Brothers films, such as Challenge of the Masters (1976), in which he portrayed the folk hero Wong Fei Hung, Executioners from Shaolin (1977), The 36th Chamber of Shaolin (1978), in which he played the lead role as Shaolin hero San Te, Dirty Ho (1979), Return to the 36th Chamber (1980), Martial Club (1981), The Eight Diagram Pole Fighter (1984), and Disciples of the 36th Chamber (1985). By the late-1980’s, he had begun accepting smaller roles, such as in Lau Kar-leung's Tiger on the Beat (1988). In 1993, he appeared opposite Jet Li in Last Hero in China.

Liu made his American film debut in 2003. He played two roles in Quentin Tarantino's Kill Bill films: Johnny Mo, the leader of the Crazy 88 yakuza gang in Volume 1 (2003), and kung fu master Pai Mei in Volume 2 (2004). Other than being a staple in Hong Kong action movies and his foray into Hollywood, Liu also made his Bollywood debut in 2009's Chandni Chowk to China.

In 2020, Liu was inducted into the Martial Arts History Museum Hall of Fame.

Liu was born Sin Kam-hei (traditional Chinese: 冼錦熙; simplified Chinese: 冼锦熙) in Foshan, Guangdong Province, China on August 22, 1955, prior to his adoption into another family. He is often wrongly cited as being the adopted son of Lau Cham, and adoptive brother of directors and actors Lau Kar-leung (Liu Chia-liang) and Lau Kar-wing (Liu Chia-yung). He was not adopted by the family, but is Lau Cham's godson, and adopted his surname (traditional Chinese: 劉; simplified Chinese: 刘; pinyin: Liú; Jyutping: Lau⁴) as his professional name.

In his youth (ages 15–20), he skipped school to train in Chinese martial arts without his parents' knowledge. He trained at Lau Cham's martial arts school of Hung Gar discipline, which descended from Wong Fei-hung's grand student (father to Lau Kar Leung). Lau Cham's wife assisted in his training and due to the friendship and respect Liu felt for Lau and his wife, he took on the name Lau Ka-fai. As he grew up, he found a job as a shipping clerk to make ends meet. His interests had always been towards martial arts and he was eventually offered a role by Lau Kar-leung.

Liu's first break was with Chang's Film Company (a Shaw Brothers subsidiary operating in Taiwan) acting small parts for such films as 5 Shaolin Masters, Shaolin Martial Arts, and 4 Assassins. He starred in Challenge of the Masters (1976), as the folk hero Wong Fei Hung, and was featured in Executioners From Shaolin (1977) before starring in his signature role as Shaolin hero San Te in The 36th Chamber of Shaolin.

The tale of the imperialistic struggle, while not a new one, was significant for the intense focus placed on the inner workings of Shaolin Temple itself. San Te, Liu's character, overcomes the temple's thirty-five chambers as he unwittingly undergoes the rigorous training regimen imposed by the temple's Head Abbott on the pretext of "earning" a right to study martial arts there.