| Cao Dayuan | |
| Fullname: | Cao Dayuan |
| Chinese: | 曹大元 |
| Pinyin: | Cáo Dàyuán |
| Birth Date: | 26 January 1962 |
| Birth Place: | Shanghai, China |
| Residence: |  China |
| Turnedpro: | 1985 (full time) |
| Rank: | 9 dan |
| Affiliation: | Zhongguo Qiyuan |
Cáo Dàyuán, born January 26, 1962) is a professional Go player.
Cao started learning Go when he was 11. He won the 4th World Amateur Go Championship in 1982 and turned professional in 1985. He was promoted to 9 dan in 1986.
Ranks #10 in total number of titles in China.
| Title | Years Held | |
|---|---|---|
| Current | 5 | |
| NEC Cup (China) | 1996 | |
| CCTV Cup | 1996, 1998 | |
| National Go Individual | 1994 | |
| New Sports Cup | 1986 |
| Title | Years Lost | |
|---|---|---|
| Current | 8 | |
| Mingren | 1993 | |
| NEC Cup | 1997, 1998 | |
| CCTV Cup | 1991 | |
| New Sports Cup | 1981, 1985, 1987, 1990 | |
| Defunct | 1 | |
| Qiwang | 1998 | |
| Continental | 1 | |
 Asian TV Cup | 1991 |