Yokohama F. Marinos were the defending champions, having won their fifth J.League and seventh Japanese title in 2022 in the final match of the season.
Shimizu S-Pulse and Júbilo Iwata, both from Shizuoka Prefecture, were relegated due to them finishing 17th and 18th respectively the previous season.
Kyoto Sanga finished on 16th place, but won the promotion/relegation playoffs against Roasso Kumamoto and thus retained their top league status.
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.
[15] 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.