The GS Caltex Cup (Korean: GS칼텍스배) is a Go competition.
The GS Caltex Cup replaced the LG Refined Oil Cup. It is sponsored by the GS Caltex Corporation and Daily Economic News. It currently has the biggest prize in South Korea. The main tournament is a 16 player knockout. The final is a best-of-5. Komi is 6.5 points and the time limit is 10 min main time with 3 x 40s byo-yomi. The winner's purse is 50,000,000 Won (~US$50,000).
| Year | Winner | Score | Runner-up |
|---|---|---|---|
| 1996 | Yoo Changhyuk | 3-2 | Cho Hunhyun |
| 1997 | Lee Chang-ho | 3-0 | Choi Myung-Hoon |
| 1998 | Lee Chang-ho | 3-0 | Choi Myung-Hoon |
| 1999 | Seo Bongsoo | 3-2 | Yoo Changhyuk |
| 2000 | Choi Myung-Hoon | 3-1 | Rui Naiwei |
| 2001 | Lee Chang-ho | 3-0 | Choi Myung-Hoon |
| 2002 | Lee Sedol | 3-1 | Choi Myung-Hoon |
| 2003 | Lee Chang-ho | 3-0 | Cho Hanseung |
| 2004 | Lee Chang-ho | 3-0 | Pak Yeong-hun |
| 2005 | Lee Chang-ho | 2-1 | Choi Cheol-han |
| 2006 | Lee Sedol | 3-0 | Choi Cheol-han |
| 2007 | Lee Sedol | 2-0 | Pak Yeong-hun |
| 2008 | Pak Yeong-hun | 3-0 | Won Seung-jin |
| 2009 | Cho Hanseung | 3-1 | Pak Yeong-hun |
| 2010 | Won Seungjin | 3-1 | Cho Hanseung |
| 2011 | Park Junghwan | 3-0 | Pak Yeong-hun |