| Yoo Changhyuk | |
| Fullname: | Yoo Changhyuk |
| Hangul: | 유창혁 |
| Hanja: | 劉昌赫 |
| Revisedromanization: | Yu Changhyeok |
| Mccune-Reishauer: | Yu Ch'ang-hyŏk |
| Birth Date: | 25 April 1966 |
| Birth Place: | , South Korea |
| Residence: | South Korea |
| Turnedpro: | 1984 |
| Rank: | 9 dan |
| Affiliation: | Hanguk Kiwon |
Yoo Changhyuk (born April 25, 1966) is a professional Go player in South Korea.
Yoo Changhyuk was one of Korea's best Go players. Growing up without a teacher, Yoo became a professional in 1984 and was promoted to 9 dan in 1996.[1] He has won many international tournaments for Korea.
| Title | Years Held |
|---|---|
| Current | 9 |
| Wangwi | 1991–1994 |
| Kisung | 1991 |
| KBS Baduk Wang | 1995 |
| Chunwon | 1996 |
| Maxim Cup | 2001, 2002 |
| Defunct | 9 |
| LG Refined Oil Cup | 1996 |
| Taewang | 1984, 1988 |
| Daewang | 1988 |
| Baccus Cup | 1993 |
| Paedal Cup | 1998, 1999 |
| KT Cup | 2003 |
| Paewang | 2003 |
| International | 6 |
  LG Cup | 2002 |
| Samsung Cup | 2000 |
 Fujitsu Cup | 1993, 1999 |
| Chunlan Cup | 2001 |
| Ing Cup | 1996 |
| Title | Years Lost | |
|---|---|---|
| Current | 9 | |
| Wangwi | 1995, 1999 | |
| Kisung | 1990, 1992, 2001 | |
| KBS Baduk Wang | 1992 | |
| BC Card Cup | 1993 | |
| Maxim Cup | 2000, 2004 | |
| Defunct | 12 | |
| LG Refined Oil Cup | 1999 | |
| Myungin | 1993, 2001 | |
| Baedalwang | 2000 | |
| Gukgi | 1995 | |
| Paewang | 1994, 1997 | |
| Daewang | 1989, 1991 | |
| Paedal Cup | 2000 | |
| KTF Cup | 2002 | |
| Kiwang | 1994 | |
| Continental | 1 | |
| Asian TV Cup | 1996 | |
| International | 7 | |
| LG Cup | 1997, 1998, 2000 | |
| Samsung Cup | 1996 | |
| Fujitsu Cup | 1994, 2002 | |
| Tong Yang Cup | 1998 |