The 2023 K League 1, also known as the Hana 1Q K League 1 for sponsorship reasons, was the 41st season of the top division of professional football in South Korea, and the eleventh season of the K League 1. Defending champions Ulsan Hyundai successfully defended their title.
After progressing 33 regular rounds as ever, the league was divided into two groups, the top six and the bottom six, and each team played five matches against other teams in its group.
Gwangju FC and Daejeon Hana Citizen (both promoted after absences of one and seven years, respectively) were promoted from the 2022 K League 2. Gimcheon Sangmu and Seongnam FC (both relegated after one and four years in the top flight, respectively) were relegated to 2023 K League 2.
The following twelve clubs competed in the K League 1 during the 2023 season.
The number of allowed foreign players was kept strictly to six per team, including a guaranteed slot for a player from the Asian Football Confederation countries. Teams could field at most five foreign players at any given time, including at least one player from the AFC confederation.
North Korean player An Byong-jun, who played for Suwon Samsung Bluewings, was deemed as a native player by South Korean nationality law.
Players in bold were registered during the mid-season transfer window.
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Teams played each other twice, once at home, once away.
Teams played each other once, either at home or away.
Teams played each other once, either at home or away.
The tenth-placed team and the eleventh-placed team played against the play-offs winners and the runners-up of the K League 2, respectively, in the relegation play-offs. <section begin=Details />
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Gangwon FC won 2âÂÂ1 on aggregate and therefore both clubs remain in their respective leagues.
Suwon FC won 6âÂÂ4 on aggregate and therefore both clubs remain in their respective leagues.
Joo Min-kyu, who appeared in less time than Tiago Orobó, won the top goalscorer award.
The 2023 K League Awards was held on 4 December 2023.
Attendants who entered with free ticket are not counted.