Jolin Tsai (1980-), Taiwanese singer

Tsai Ing-wen (1956–), Taiwanese DPP politician, president of the Republic of China 2016–2024

Cai Yuanpei (1868-1940), Chinese educationist and politician, who served as president of Peking University from 1917 to 1927.

Cai E (1882–1916), military leader who was a key figure in the establishment of the National Protection Army, which in 1916 fought the forces of Yuan Shikai

Shangcai, a county in Zhumadian City, Henan

Caidian District of Wuhan City, Hubei

Cai Lun (c. 50-121 AD), the Han dynasty inventor of the papermaking process

Rowdy Cai (1969-), a pioneering Taiwanese Internet writer.

Tsai Chih Chung (1948-), famous Taiwanese cartoonist specializing in retelling the Chinese classics

Cai Guoqiang (1957-), contemporary Chinese artist working with firework displays and light shows

Xincai, a county in Zhumadian City, Henan

Cai Dongfan (1877-1945), historian and historical novelist

Choy Li Fut (Chinese martial art)

Zeiss Company (Carl Zeiss AG, specializing in optical and opto-electronic industries, headquartered in Oberkochen, Germany)

Cai Xiang (1012-1067), Song calligrapher