2019 K League 2

The 2019 K League 2 was the seventh season of the K League 2, the second-highest division in the South Korean football league system. Its champions could be promoted to the K League 1 the next season, and second, third and fourth-placed team advanced to the promotion playoffs.

Team changes
Relegated from K League 1
 * Jeonnam Dragons

Promoted to K League 1
 * Seongnam FC

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. Players in bold  are players who joined midway through the competition.

Promotion playoffs
When the first round or semi-final match was finished as a draw, its 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 2019 K League 2 playoffs and the 11th-placed club of the 2019 K League 1.

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Busan IPark won 2–0 on aggregate and were promoted to the K League 1, while Gyeongnam FC were relegated to the K League 2.

Attendance
Attendants who entered with free ticket were not counted.