The 2023 season was FC Seoul's 40th season in the K League 1.

The club also participated in the 2023 edition of the FA Cup, being knocked out on the third round.

A defeat in the FA Cup Final and a 9th place finish on 2022 means the club does not participate in the 2023-24 AFC Champions League.

Last updated: 1 July 2023 Source: FC Seoul Official Website Last updated: 2 December 2023.

Source: Soccerway The club started the competition at the third round, as a non-ACL team from K League 1.