List of Hot 100 number-one singles of 2021 (Japan)

The following is a list of weekly number-one singles on the Billboard Japan Hot 100 chart in 2021.

Chart history

Butter" by BTS is the longest running number-one song of 2021, with four weeks atop the chart.

"Homura" by LiSA is the year's longest running number-one song by a solo artist, topping the chart for two weeks.

"Take a Picture" by NiziU is the year's longest running number-one song by a female group, topping the chart for two weeks.

Issue date	Song	Artist(s)	Ref.
January 4	"Beautiful"	NEWS	[1]
January 11	"Homura"	LiSA	[2]
January 18			[3]
January 25	"Shūkan Umakuiku Yōbi"	Johnny's West	[4]
February 1	"Grandeur"	Snow Man	[5]
February 8	"Boku wa Boku o Suki ni Naru"	Nogizaka46	[6]
February 15	"Koiochi Flag"	SKE48	[7]
February 22	"Kimi to Mitai Sekai"	Kanjani Eight	[8]
March 1	"Boku ga Boku Janai Mitai da"	SixTones	[9]
March 8	"Luv Bias"	Kis-My-Ft2	[10]
March 15	"Usseewa"	Ado	[11]
March 22	"Roar"	KAT-TUN	[12]
March 29	"One Last Kiss"	Hikaru Utada	[13]
April 5	"Let's Music"	Sexy Zone	[14]
April 12	"Take a Picture"	NiziU	[15]
April 19			[16]
April 26	"Ban"	Sakurazaka46	[17]
May 3	"Not Alone"	Seventeen	[18]
May 10	'"Born to Be Wild"	JO1	[19]
May 17	"Something New"	Johnny's West	[20]
May 24	"Negative Fighter"	Hey! Say! JUMP	[21]
May 31	"Magic Touch"	King & Prince	[22]
June 7	"Butter"	BTS	[23]
June 14			[24]
June 21	"Gomen ne Fingers Crossed"	Nogizaka46	[25]
June 28	"Pale Blue"	Kenshi Yonezu	[26]
July 5	"Fushigi"	Gen Hoshino	[27]
July 12	"Butter"	BTS	[28]
July 19			[29]
July 26	"Hello Hello"	Snow Man	[30]
August 2	"Permission to Dance"	BTS	[31]
August 9	"Dekkai Ai"	Johnny's West	[32]
August 16	"Natsu no Hydrangea"	Sexy Zone	[33]
August 23	"Mascara"	SixTones	[34]
August 30	"Real"	JO1	[35]
September 6	"Gunjō Runaway"	Hey! Say! JUMP	[36]
September 13	"Ano Koro no Kimi o Mitsuketa"	SKE48	[37]
September 20	"We Just Go Hard"	KAT-TUN feat. AK-69	[38]
September 27	"Fear"	Kis-My-Ft2	[39]
October 4	"Kimi ni Shikarareta"	Nogizaka46	[40]
October 11	"Nemohamo Rumor"	AKB48	[41]
October 18	"Koi Furu Tsukiyo ni Kimi Omou"	King & Prince	[42]
October 25	"Nagaredama"	Sakurazaka46	[43]
November 1	"Akeboshi"	LiSA	[44]
November 8	"Tteka"	Hinatazaka46	[45]
November 15	"Gifted"	Be First	[46]
November 22	"Ubu Love"	Naniwa Danshi	[47]
November 29			[48]
December 6	"Sing-Along"	Hey! Say! JUMP	[49]
December 13	"Secret Touch"	Snow Man	[50]
December 20	"Zankyosanka"	Aimer	[51]
December 27	"Bokura no Kisetsu"	JO1	[52]

See also

• List of Billboard Japan Hot Albums number ones of 2021