The following is a list of weekly number-one singles on the Billboard Japan Hot 100 chart in 2021.
Chart history
Issue dateSongArtist(s)Ref.January 4"Beautiful"NEWSJanuary 11 "Homura" LiSAJanuary 18January 25"Shūkan Umakuiku Yōbi"Johnny's WestFebruary 1"Grandeur"Snow ManFebruary 8"Boku wa Boku o Suki ni Naru"Nogizaka46February 15"Koiochi Flag"SKE48February 22"Kimi to Mitai Sekai"Kanjani EightMarch 1"Boku ga Boku Janai Mitai da"SixTonesMarch 8"Luv Bias"Kis-My-Ft2March 15"Usseewa"AdoMarch 22"Roar"KAT-TUNMarch 29"One Last Kiss"Hikaru UtadaApril 5"Let's Music"Sexy ZoneApril 12"Take a Picture"NiziUApril 19April 26"Ban"Sakurazaka46May 3"Not Alone"SeventeenMay 10'"Born to Be Wild"JO1May 17"Something New"Johnny's WestMay 24"Negative Fighter"Hey! Say! JUMPMay 31"Magic Touch"King & PrinceJune 7"Butter"BTSJune 14June 21"Gomen ne Fingers Crossed"Nogizaka46June 28"Pale Blue"Kenshi YonezuJuly 5"Fushigi"Gen HoshinoJuly 12"Butter"BTSJuly 19July 26"Hello Hello"Snow ManAugust 2"Permission to Dance"BTSAugust 9"Dekkai Ai"Johnny's WestAugust 16"Natsu no Hydrangea"Sexy ZoneAugust 23"Mascara"SixTonesAugust 30"Real"JO1September 6"Gunjō Runaway"Hey! Say! JUMPSeptember 13"Ano Koro no Kimi o Mitsuketa"SKE48September 20"We Just Go Hard"KAT-TUN feat. AK-69September 27"Fear"Kis-My-Ft2October 4"Kimi ni Shikarareta"Nogizaka46October 11"Nemohamo Rumor"AKB48October 18"Koi Furu Tsukiyo ni Kimi Omou"King & PrinceOctober 25"Nagaredama"Sakurazaka46November 1"Akeboshi" LiSANovember 8"Tteka"Hinatazaka46November 15"Gifted"Be FirstNovember 22"Ubu Love"Naniwa DanshiNovember 29December 6"Sing-Along"Hey! Say! JUMPDecember 13"Secret Touch"Snow ManDecember 20"Zankyosanka"AimerDecember 27"Bokura no Kisetsu"JO1
See also List of Billboard Japan Hot Albums number ones of 2021
References