2015 K League Challenge

The 2015 K League Challenge was the third season of the K League 2, the second-highest division in the South Korean football league system. Champions and winners of promotion playoffs could be promoted to the K League Classic.

Team changes
Relegated from K League Classic
 * Gyeongnam FC
 * Sangju Sangmu

Promoted to K League Classic
 * Daejeon Citizen
 * Gwangju FC

Newly joined
 * Seoul E-Land

Personnel and sponsoring
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Foreign players
Restricting the number of foreign players strictly to four per team, including a slot for a player from AFC countries. A team could use four foreign players on the field each game.

Promotion playoffs
When the first round and semi-final match were finished as draws, their winners were decided on the regular season rankings without extra time and the penalty shoot-out.

Final
The promotion-relegation playoffs were held between the winners of the 2015 K League Challenge playoffs and the 11th-placed club of the 2015 K League Classic. The winners on aggregate score after both matches earned entry into the 2016 K League Classic.

Suwon FC won 3–0 on aggregate and were promoted to the K League Classic, while Busan IPark were relegated to the K League Challenge.

Attendance
Attendants who entered with free ticket were not counted.

Awards
The 2015 K League Awards was held on 1 December 2015.

Main awards

 * Most Valuable Player: 🇧🇷 Johnathan (Daegu FC)
 * Top goalscorer: 🇧🇷 Johnathan (Daegu FC)
 * Top assist provider: 🇰🇷 Kim Jae-sung (Seoul E-Land)
 * Manager of the Year: 🇰🇷 Cho Duck-je (Suwon FC)