List of Oricon number-one singles of 2015
# List of Oricon number-one singles of 2015

The highest-selling singles in Japan are ranked in the weekly Oricon Singles Chart, which is published by Oricon Style magazine. The data are compiled by Oricon based on each singles' weekly physical sales. This list includes the singles that reached the number one place on that chart in 2015.

## Chart history

| Issue date | Song | Artist(s) |
| - | - | - |
| January 5 | "Thank You Jan!" | Kis-My-Ft2 |
| January 12 | "Genkidane" | Kamen Joshi |
| January 19 | "Kaguya" | NEWS |
| January 26 | "Uchōten" | B'z |
| February 2 | "Dead or Alive" | KAT-TUN |
| February 9 | "Guilty Love" | 2PM |
| February 16 | "Zundoko Paradise" | Johnny's West |
| February 23 | "Kioku / Kokoro Odoreba" | Subaru Shibutani |
| March 2 | "Karei Naru Gyakushu / Humor Sichau yo" | SMAP |
| March 9 | "Sakura" | Arashi |
| March 16 | "Green Flash" | AKB48 |
| March 23 | "Kiss Kiss Kiss" | KAT-TUN |
| March 30 | "Inochi wa Utsukushii" | Nogizaka46 |
| April 6 | "Kiss Damashii" | Kis-My-Ft2 |
| April 13 | "Coquettish Jūtai Chū" | SKE48 |
| April 20 | "Wonderful World / Ça va? Ça va?" | Juice=Juice |
| April 27 | "Starting Over" | Sandaime J Soul Brothers |
| May 4 | "12 Byō" | HKT48 |
| May 11 | "Chau/I Need You" | Hey! Say! JUMP |
| May 18 | "Timeless" | V6 |
| May 25 | "Aozora no Shita, Kimi no Tonari" | Arashi |
| June 1 | "Bokutachi wa Tatakawanai" | AKB48 |
| June 8 | "Bokutachi wa Tatakawanai" | AKB48 |
| June 15 | "Tsuyoku Tsuyoku Tsuyoku" | Kanjani Eight |
| June 22 | "Red" | B'z |
| June 29 | "For You" | BTS |
| July 6 | "Chumu Chumu" | NEWS |
| July 13 | "Cha Cha Cha" | Sexy Zone |
| July 20 | "Summer Madness" | Sandaime J Soul Brothers featuring Afrojack |
| July 27 | "Dorian Shōnen" | NMB48 |
| August 3 | "Taiyō Nokku" | Nogizaka46 |
| August 10 | "Bari Hapi" | Johnny's West |
| August 17 | "Maemuki Scream!" | Kanjani Eight |
| August 24 | "Mae Nomeri" | SKE48 |
| August 31 | "I am a HERO" | Masaharu Fukuyama |
| September 7 | "Halloween Night" | AKB48 |
| September 14 | "Ai o Sakebe" | Arashi |
| September 21 | "Otherside / Ai ga Tomaru Made wa" | SMAP |
| September 28 | "All For You" | Generations from Exile Tribe |
| October 5 | "SOS / Present" | Sekai no Owari |
| October 12 | "Moonlight Walker" | A.B.C-Z |
| October 19 | "Must Be Now" | NMB48 |
| October 26 | "AAO" | Kis-My-Ft2 |
| November 2 | "Kimi Attraction" | Hey! Say! JUMP |
| November 9 | "Ima, Hanashitai Dareka ga Iru" | Nogizaka46 |
| November 16 | "Love Me Right (Romantic Universe)" | Exo |
| November 23 | "Saigo mo Yappari Kimi" | Kis-My-Ft2 |
| November 30 | "Yume wo Mireba Kizutsuku Kotomo Aru" | Kinki Kids |
| December 7 | "Shekarashika!" | HKT48 ft.Kishidan |
| December 14 | "Samurai Song" | Kanjani Eight |
| December 21 | "Kuchibiru ni Be My Baby" | AKB48 |
| December 28 | "Colorful Eyes" | Sexy Zone |
