The 2009 Korean League Cup, known as the Peasce Cup Korea 2009 for sponsorship reasons, was the 17th season of League Cup competition for K League's 15 football clubs. The competition began on March 25, 2009, and ended with the two-legged final on September 2 and September 16.
All clubs playing in the K-league, except they are competing are AFC Champions League. In group formation, Group A was composed an odd rank clubs in previous season, plus newly formed Gangwon FC. Group B was composed an even rank clubs in previous season. All clubs are playing each other once, only winner and runner-up of each group go to knockout stage.