Kate Tsui Tsz-Shan (traditional Chinese: 徐子珊) is a Miss Hong Kong pageant winner and a TVB actress.
Kate Tsui graduated from the University of California, Davis, majoring in Japanese. She is skilled in different interests such as Acting, Dancing, Learning Languages, and Snowboarding. Her childhood dream was to become a successful dancer.

After her studies, she entered the Miss Hong Kong 2004 pageant. She took the winner's crown along with Miss Photogenic award, Fitness award and Miss International Goodwill, taking the most awards since Shirley Yeung.

Tsui entered the Miss Chinese International 2005 pageant. Although a favorite for the crown, she placed in the top 5, losing to Leanne Li and Fala Chen.