Kay Tse On-kei (Chinese: 謝安琪; born 13 March 1977) is a Hong Kong Cantopop songwriter, recording-artist, entertainer, and one of the premier Cantonese singers. Raised In Hong Kong.

Tse made her debut to the music industry and was signed with Ban Ban Music in 2005 and released her debut album. She became a prominent figure in the Cantopop culture. She is known for her versatile vocal range and expertise in various music genres, especially in jazz.