Samuel Hui Koon-kit (born 6 September 1948), usually known as Sam Hui, is a Hong Kong musician, singer, songwriter and actor. He is credited with popularising Cantopop both with the infusion of Western-style music and using popular, street Cantonese jargon in his lyrics writing. Hui is considered by some to be the first major superstar of Cantopop, called the God of Song.

Hui graduated from the Faculty of Social Sciences of the University of Hong Kong,Ying Wa College and St. Francis Xavier's College in the late 1960s and early 1970s. Hui and his two older brothers, Michael and Ricky, worked on several comedies in the early 1970s. Hui has also gained credit for popularising Cantopop, by incorporating the idiosyncrasies of Western popular music into the old Cantopop genre.

Hui started his career as a host on a youth music TV show on the TV network TVB. Sam and Michael Hui starred as the hosts in 精裝雙星報喜 (The Hui's Brothers Show). At that time, he was the lead musician of his band named The Lotus. In the early years of his career, Hui performed English songs that were popular in Britain and the United States. He wrote the theme songs for the comedies produced by his brother, Michael Hui, and started performing Cantonese songs.

Hui's music appealed to the Hong Kong masses, particularly the working class, with simple lyrics and a light-hearted nature which was popular in Hong Kong music in the late 1970s. One of his most popular song during the mid-1970s was the theme song of the film The Private Eyes. It was a humorous reflection on the plight of the harsh working life for middle and lower class in Hong Kong. He wrote most of the compositions and personally wrote most of the humorous lyrics that generally encompassed current issues in Hong Kong such as the song "Could Not Care Less About 1997" (話知你97), which encouraged Hong Kong people to throw caution to the wind and enjoy their life instead of worrying about the imminent handover to the People's Republic of China on 1 July 1997. While some of his songs are light-hearted, others have philosophical messages that are brought out with artful use of Chinese words that have multiple symbolism. Examples can be seen in his farewell song in 1992 and "From the Heart of a Loafer" (浪子心聲), where for Cantopop, sophisticated language and messages are rare in the lyrics of contemporary artists.

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