Tsai Shu-min (Chinese: 蔡 淑敏; pinyin: Cài Shūmǐn; born February 4, 1981, in Changhua County) is a retired Taiwanese swimmer, who specialized in sprint and middle-distance freestyle, but also competed in backstroke and in individual medley.

Tsai made her first Chinese Taipei team, as a 15-year-old teen, at the 1996 Summer Olympics in Atlanta.

[5][6][7] Two years later, at the 1998 FINA World Championships in Perth, Australia, Tsai narrowly missed the podium by a hundredth of a second (0.01) in the 200 m freestyle at 1:59.93.

Swimming in heat three, she faded down the stretch to pick up a seventh seed in 2:06.12, more than three seconds below her entry standard.

[13][14] Two days later, in the 100 m freestyle, Tsai posted a time of 59.39 to overhaul a minute barrier in the same heat, but fell short to forty-sixth overall on the morning prelims.