Cai Yun

Cai Yun (Simplified Chinese: 蔡赟, pinyin: Cài Yūn) (born 19 January 1980 in Jiangsu) is a male badminton player from the People's Republic of China.

Cai competed for China in badminton at the 2004 Summer Olympics in men's doubles with partner Fu Haifeng. They had a bye in the first round and defeated Keita Masuda and Tadashi Ohtsuka of Japan in the second. In the quarterfinals, Cai and Fu lost to Jens Eriksen and Martin Lundgaard Hansen of Denmark 3–15, 15–11, 15–8.