Kent Cheng Jak-si (Chinese: 鄭則士, born 22 May 1951) is a Hong Kong film and television actor. He is a two time recipient of the best actor award at the Hong Kong Film Awards.

• 心跳一百 (1987)

  
• 談判專家 (2024)

  
• 舞廳 (1981)

  
• Wong Fei Hung Series : The Eight Assassins (1995)

  
• A Watchdog‘s Tale (2009)