List of Hot 100 number-one singles of 2021 (Japan)
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The following is a list of weekly number-one singles on the Billboard Japan Hot 100 chart in 2021.
Chart history
| 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] |