List of Oricon number-one singles of 2020
# List of Oricon number-one singles of 2020

The following is a list of Oricon number-one singles of 2020.

## Chart history

| Issue date | Song | Artist(s) |
| - | - | - |
| January 6 | "Gattan Gotton Go!" | Boys and Men |
| January 13 | "Inochi no Uta" | Mariya Takeuchi |
| January 20 | "Initial/Yume o Uchinuku Shunkan ni!" | Poppin'Party |
| January 27 | "Sōyūtoko Aru yo ne?" | SKE48 |
| February 3 | "Imitation Rain/D.D." | SixTones vs. Snow Man |
| February 10 | "Mubou na Yume wa Sameru Koto ga Nai" | STU48 |
| February 17 | "Imitation Rain/D.D." | SixTones vs. Snow Man |
| February 24 | "Imitation Rain/D.D." | SixTones vs. Snow Man |
| March 2 | "Sonna Koto Nai yo" | Hinatazaka46 |
| March 9 | "I Am/Muah Muah" | Hey! Say! JUMP |
| March 16 | "Protostar" | JO1 |
| March 23 | "Brava!! Brava!! Brava!!/Ray of Light" | Jaejoong |
| March 30 | "Shitsuren, Arigatō" | AKB48 |
| April 6 | "Shiawase no Hogoshoku" | Nogizaka46 |
| April 13 | "Fallin' Flower" | Seventeen |
| April 20 | "Movin' On" | Sandaime J Soul Brothers |
| April 27 | "Ai o Shiru" | Last Idol |
| May 4 | "3−2" | HKT48 |
| May 11 | "The Beyond Gunpla 40th Edition" | Luna Sea |
| May 18 | "3−2" | HKT48 |
| May 25 | "Fly with Me" | Millennium Parade |
| June 1 | "Starry Sky" | Passcode |
| June 8 | "Mirai wa Onna no Tame ni Aru" | Walküre |
| June 15 | "Top" (Japanese ver.) | Stray Kids |
| June 22 | "Mazy Night" | King & Prince |
| June 29 | "Kanzai Boya" | KinKi Kids |
| July 6 | "Shōko" | Johnny's West |
| July 13 | "Last Mermaid..." | Hey! Say! JUMP |
| July 20 | "Fanfare" | Twice |
| July 27 | "Nights Cold" | Tomohisa Yamashita |
| August 3 | "Navigator" | SixTones |
| August 10 | "Kite" | Arashi |
| August 17 | "Run" | Sexy Zone |
| August 24 | "Smile" | Twenty Twenty |
| August 31 | "Re:Live" | Kanjani Eight |
| September 7 | "Stargazer" | JO1 |
| September 14 | "Omoidaseru Koi wo Shiyō" | STU48 |
| September 21 | "Oh Yeah" | Boys and Men |
| September 28 | "Endless Summer" | Kis-My-Ft2 |
| October 5 | "It's My Life/Pineapple" | V6 |
| October 12 | "Your Song" | Hey! Say! JUMP |
| October 19 | "Kissin' My Lips/Stories" | Snow Man |
| October 26 | "Homura" | LiSA |
| November 2 | "Homura" | LiSA |
| November 9 | "Homura" | LiSA |
| November 16 | "Not Found" | Sexy Zone |
| November 23 | "New Era" | SixTones |
| November 30 | "Koi Nanka No Thank You!" | NMB48 |
| December 7 | "Seishun 'Subliminal'" | =Love |
| December 14 | "Step and a Step" | NiziU |
| December 21 | "Nobody's Fault" | Sakurazaka46 |
| December 28 | "I Promise" | King & Prince |
