The 2023 J3 League, referred to as the for sponsorship reasons, was the 10th season of the J3 League under its current name.
Iwaki FC and Fujieda MYFC were promoted to the J2 League after being champions and runners-up of last season's J3.
FC Ryukyu and Iwate Grulla Morioka were relegated from the J2 League after relatively short stints at the 2nd division, with Ryukyu spending four seasons, and Iwate spending just a single season. The clubs finished as 21st and 22nd-placed team at the 2022 J2 League, respectively.
Nara Club and FC Osaka were promoted to the J3 League after being respectively, champions and runners-up of last season's JFL. Both teams are making their debut in the J3 League after obtaining a J.League License, to enable their promotion from the JFL.
This season is the first of the J3 League to have 20 teams, seeing an increase from last season's 18 teams. About the number of teams, there will be no future changes, as the J.League confirmed that from 2024, all the three professional leagues would have 20 teams in each.
This season was the first to feature promotion/relegation from the Japan Football League, enabling the possibility for teams to be relegated from the J3. The system of promotion/relegation between the leagues can be determined by the eligibility (Promotion to J3 requires a J.League license) of the JFL's champions and runners-up for the season.
The dates and the host teams of the promotion/relegation play-off were pre-determined by the J.League. In case it happens, it will be played in two legs on 9 and 16 December, with the J3 team hosting the second leg.
From the 2021 season onwards, there is no limitations on signing foreign players, but clubs could only register up to five of them for a single matchday squad. Players from J.League partner nations (Thailand, Vietnam, Myanmar, Malaysia, Cambodia, Singapore, Indonesia, and Qatar) were exempted from these restrictions.
Primary venues to be used in the 2023 J3 League season: