2020 in Japanese music

The year 2020 in Japanese music.

Debuting groups

 * All at Once
 * Arcana Project
 * Beatcats
 * BIN
 * Chō Tokimeki Sendenbu
 * EXIT
 * Go to the Beds
 * JO1
 * Morfonica
 * Nature
 * NCT Dream
 * Nemophila
 * NiziU
 * Orbit
 * Paradises
 * Piggs
 * Sakurazaka46
 * SixTones
 * Snow Man
 * Stray Kids
 * Tomorrow X Together
 * Zamb

Debuting soloists

 * Ado
 * Ai Furihata
 * Fujii Kaze
 * Hikaru
 * Yurina Hirate
 * Hoshimachi Suisei
 * Gakuto Kajiwara
 * Ryota Katayose
 * Keiko
 * Takuya Kimura
 * Haruka Kudō
 * Akane Kumada
 * Tomori Kusunoki
 * Liyuu
 * Karin Miyamoto
 * Nana Mori
 * Win Morisaki
 * Yuki Nakashima
 * Yui Ninomiya
 * Koutaro Nishiyama
 * Sae Ōtsuka
 * Miki Satō
 * Riho Sayashi
 * Nanaka Suwa
 * Aina Suzuki
 * Azumi Waki
 * Reina Washio
 * Jun. K

Returning from hiatus

 * 12012
 * Does
 * Chris Hart
 * Hirakawachi Itchōme
 * Iz*One
 * Lindberg
 * Pour Lui
 * Marble
 * Nightmare
 * Seikima-II
 * Tokyo Jihen
 * Under17

Events

 * 71st NHK Kōhaku Uta Gassen

Number-ones

 * Oricon number-one albums
 * Oricon number-one singles
 * Hot 100 number-one singles

Awards

 * 62nd Japan Record Awards
 * 2020 MTV Video Music Awards Japan

Disbanding

 * Carry Loose
 * E-girls
 * Fairies
 * Group Tamashii
 * Gugudan
 * Hachimitsu Rocket
 * Magnolia Factory
 * Party Rockets GT
 * PrizmaX
 * Sora tob sakana
 * SudannaYuzuYully
 * Tegomass
 * Uijin

Retiring

 * Chisato Okai
 * Manami Numakura
 * Mayu Watanabe

Going on hiatus

 * AAA
 * Arashi
 * Baroque
 * College Cosmos
 * Good Morning America
 * Masahiko Kondō
 * Ladybaby
 * Mrs. Green Apple
 * Marius Yo