The GS Caltex Cup (Korean: GS칼텍스배) is a Go competition.
The GS Caltex Cup replaced the LG Refined Oil Cup. It is organized by the Maeil Business Newspaper, Maeil Broadcasting Network (MBN), and Korea Baduk Association, and sponsored by GS Caltex. The winner receives 70 million won in prize money, and the runner-up receives 30 million won (as of 2024). The final is a best-of-5. Komi is 6.5 points.
Players begin with 30 minutes of thinking time on their clock and add a 30 second increment per move (Fischer time). The time increment system was introduced in 2024, replacing the byoyomi system.
| Year | Winner | Score | Runner-up | ||
| 1 | 3–2 | Cho Hunhyun | |||
| 2 | 3–0 | Choi Myung-hoon | |||
| 3 | 3–0 | ||||
| 4 | 3–2 | Yoo Changhyuk | |||
| 5 | 3–1 | Rui Naiwei | |||
| 6 | 3–0 | Choi Myunghoon | |||
| 7 | 3–1 | ||||
| 8 | 3–0 | Cho Hanseung | |||
| 9 | 3–0 | Park Yeonghun | |||
| 10 | 3–2 | Lee Changho | |||
| 11 | 3–0 | Choi Cheol-han | |||
| 12 | 3–2 | Lee Sedol | |||
| 13 | 3–0 | Won Seongjin | |||
| 14 | 3–1 | Park Yeonghun | |||
| 15 | 3–1 | Cho Hanseung | |||
| 16 | Park Junghwan | 3–0 | Park Yeonghun | ||
| 17 | 3–2 | ||||
| 18 | 3–0 | Lee Sedol | |||
| 19 | 3–0 | Choi Cheol-han | |||
| 20 | 3–1 | ||||
| 21 | 3–0 | Yun Chanhee | |||
| 22 | 3–2 | Kim Jiseok | |||
| 23 | 3–2 | Lee Sedol | |||
| 24 | 2019 | 3–0 | Kim Jiseok | ||
| 25 | 2020 | 3–0 | |||
| 26 | 2021 | 3–2 | Byun Sangil | ||
| 27 | 2022 | 3–0 | Byun Sangil | ||
| 28 | 2023 | 3–0 | Choi Jeong | ||
| 29 | 2024 | 3–0 | Park Sang-jin |