This article summarize the Japanese football in the 2020 season.
For this season, as a result of the COVID-19 pandemic, there was no relegation in place for the professional J1, J2 and J3 League, with the J1 League expanding to 20 clubs for the 2021 season. The Japan Football League curtailed its season to play only the second half and had no relegation, thus expanding to maximum 18 clubs for the 2021 season.
Teams relegated from J1 League
Teams promoted to J1 League
Teams relegated from J2 League
Teams promoted to J2 League
Teams relegated from J3 League
Teams promoted to J3 League
Teams relegated from Japan Football League
Teams promoted to Japan Football League
Team(s) relegated from Nadeshiko Division 1
Teams at the Division 1 play-offs
Team(s) promoted to Nadeshiko Division 1
Team(s) relegated from Nadeshiko Division 2
Team(s) at the Division 2 play-offs