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This is a list of number one singles on the Billboard Japan Hot 100 chart in Japan in 2010.
| Date | Song | Artist |
|---|---|---|
| January 4 | " Fuyu Koi" | Kanjani Eight |
| January 18 | "Fly Away" | Rake |
| January 25 | ||
| February 1 | " Gloria" | Yui |
| February 8 | " Break Out!" | Tohoshinki |
| February 15 | "Modorenai Ashita" | Aiko |
| February 22 | " Love Yourself (Kimi ga Kirai na Kimi ga Suki)" | KAT-TUN |
| March 1 | " Sakura no Shiori" | AKB48 |
| March 8 | " Hitomi no Screen" | Hey! Say! JUMP |
| March 15 | " Troublemaker" | Arashi |
| March 22 | ||
| March 29 | "Sakura" | Monkey Majik |
| April 5 | " Toki o Tomete" | Tohoshinki |
| April 12 | "Sakura Girl" | NEWS |
| April 19 | " Yūki 100%" | NYC |
| April 26 | " Happy" | Bump of Chicken |
| May 3 | " Mahō no Ryōri (Kimi Kara Kimi e)" | |
| May 10 | "Go! Go! Maniac" | Ho-kago Tea Time |
| May 17 | "Arigatō" | Ikimono-gakari |
| May 24 | " Going!" | KAT-TUN |
| May 31 | " Monster" | Arashi |
| June 7 | " Ponytail to Chouchou" | AKB48 |
| June 14 | "Rain" | Sid |
| June 21 | "Victory" | Exile |
| June 28 | ||
| July 5 | "Okay" | Koshi Inaba |
| July 12 | " Wonderful World!!" | Kanjani Eight |
| July 19 | " To Be Free" | Arashi |
| July 26 | ||
| August 2 | "This Is Love" | SMAP |
| August 9 | "One in a Million" | Tomohisa Yamashita |
| August 16 | "This Is Love" | SMAP |
| August 23 | " Hotaru" | Masaharu Fukuyama |
| August 30 | " Heavy Rotation" | AKB48 |
| September 6 | " Life (Me no Mae no Mukō e)" | Kanjani Eight |
| September 13 | " Wildflower" | Superfly |
| September 20 | " Love Rainbow" | Arashi |
| September 27 | "Motto Tsuyoku" | Exile |
| October 4 | ||
| October 11 | "Kimi ni Todoke" | Flumpool |
| October 18 | " Dear Snow" | Arashi |
| October 25 | "Uchūhikōshi e no Tegami" | Bump of Chicken |
| November 1 | " Yoku Asobi Yoku Manabe" | NYC |
| November 8 | " Beginner" | AKB48 |
| November 15 | "Fighting Man" | NEWS |
| November 22 | " Hatenai Sora" | Arashi |
| November 29 | " Change Ur World" | KAT-TUN |
| December 6 | " Goodbye Happiness" | Hikaru Utada |
| December 13 | "Family (Hitotsu ni Naru Koto)" | KinKi Kids |
| December 20 | " Chance no Junban" | AKB48 |
| December 27 | " Arigatō (Sekai no Doko ni Ite mo)" | Hey! Say! JUMP |