2018 FC Seoul season
The 2018 season was FC Seoul's 35th season in the K League 1.
Pre-season
- In Murcia, Spain: From 6 January 2018 to 7 February 2018
- In Kagoshima, Japan: From 14 February 2018 to 22 February 2018
Match reports and match highlights
''' '''Season statistics
Attendance records
- Season total attendance is K League 1, FA Cup, and AFC Champions League combined
Players
Team squad
All players registered for the 2018 season are listed.| No. | Pos. | Nationality | Player | Notes |
| 1 | GK |  Out on loan and military serviceNote: 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 Sanjgu Sangmu or Ansan Mugunghwa for military service in the middle of the season. ※ Conscripted: Transferred to Sangju Sangmu or Ansan Mugunghwa for military service after the end of the season. |