Due to the addition of the KT Wiz into the KBO, the 2015 KBO league schedule was increased to each team playing 144 games during the regular season (each team had played 128 games during the 2014 regular season), with each team playing each other 16 times.

[1] In July, the best players participated in the 2015 KBO All-Star Game.

The participating franchises were divided into two regions, the Dream All-Stars (Samsung Lions, Doosan Bears, Lotte Giants, SK Wyverns, KT Wiz) and Nanum All-Stars (Kia Tigers, Hanwha Eagles, LG Twins, Nexen Heroes, NC Dinos).

Starting in 2015, the fourth-place and the fifth-place teams played in a "Wildcard" game.

Due to the high proportion of pitchers signed in previous years, beginning in 2014 the league mandated that at least one of the foreign players must be a position player.