The 2023 J1 League, also known as the for sponsorship reasons, was the 31st season of the J1 League, the top Japanese professional league for association football clubs, since its establishment in 1992. This was the ninth season of J1 League after being renamed from J. League Division 1.
Yokohama F. Marinos were the defending champions, having won their fifth J.League and seventh Japanese title previous season. Vissel Kobe won their first ever league title with one game to go.
This season was the last as an 18 team-competition. At the end of season, only one club would be relegated to the J2 League as the number of clubs was expanded from 18 to 20 clubs from the 2024 season.
There were two teams relegated last season to the 2023 J2 League. Shimizu S-Pulse and Júbilo Iwata, both from Shizuoka Prefecture, were relegated due to them finishing 17th and 18th respectively the previous season. Thus, this was the first Japanese top-flight season to not feature any team from the region.
Kyoto Sanga finished on 16th place, but won the promotion/relegation playoffs against Roasso Kumamoto and thus retained their top league status. Had Roasso won, it would have been their first ever promotion to the top-flight.
Two teams were promoted from the 2022 J2 League: Albirex Niigata, who won the title and returned to J1 after a five-year absence, and Yokohama FC, who finished second, returning to the J1 after just a season playing on the J2 League.
From the 2021 season, there are no limitations on signing foreign players, but clubs can only register up to five of them for a single matchday squad. Players from J.League partner nations (Thailand, Vietnam, Morocco, Malaysia, Cambodia, Singapore, Indonesia, Saudi Arabia, Palestine, Argentina, Australia, Brazil, Tunisia, Egypt, and Qatar) were exempted from these restrictions.