The GS Caltex Cup (Korean: GS칼텍스배 바둑기전) 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).
Players begin with 30 minutes of thinking time on their clock and add a 30 second increment per move (Fischer time).