2010 K League Championship is postseason championship playoff of 2010 K League. The championship are a series of playoff matches contested by the teams 1st to 6th in the 2010 K League table. All matches are played one leg, except final is played two legs. With 6th playing 3rd and 5th playing 4th, the winners of each match play one match in the higher team's home ground. This match's winner gains the next 2011 AFC Champions League spot by the secured 3rd position. The winner of second round playing regular season's 2nd position team in the 2nd team's home ground. The final is played home and away format.