2021 FC Seoul season

The 2021 season is FC Seoul's 38th season in the K League 1.

Pre-season

 * First Winter Training Camp: In Changwon, South Korea - From 7 January 2021 to 27 January 2021
 * Second Winter Training Camp: In Jeju, South Korea - From 1 February 2021 to 21 February 2021

Match reports and match highlights
Fixtures and Results at FC Seoul Official Website 

Attendance records

 * Season total attendance is K League 1, FA Cup, and AFC Champions League combined

Team squad

 * All players registered for the 2021 season are listed.

Out on loan and military service
Note: Where a player has not declared an international allegiance, nation is determined by place of birth.

※ In: Transferred from other teams in the middle of the season.

※ Out: Transferred to other teams in the middle of the season.

※ Discharged: Transferred from Gimcheon Sangmuu for military service in the middle of the season (registered in 2021 season).

※ Conscripted: Transferred to Gimcheon Sangmu for military service after the end of the season.