List of Oricon number-one singles of 2018
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Chart history
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 1 | "White Love" | Hey! Say! JUMP | [1] |
| January 8 | "Warota People" | NMB48 | [2] |
| January 15 | "Nigemizu" | Nogizaka46 | [3] |
| January 22 | "Muishiki no Iro" | SKE48 | [4] |
| January 29 | "LPS" | NEWS | [5] |
| February 5 | "Topaz Love/DESTINY" | KinKi Kids | [6] |
| February 12 | "Kurayami" | STU48 | [7] |
| February 19 | "Candy Pop" | Twice | [8] |
| February 26 | "Maeomuke" | Hey! Say! JUMP | [9] |
| March 5 | "Find the Answer" | Arashi | [10] |
| March 12 | "Doraemon" | Gen Hoshino | [11] |
| March 19 | "Glass wo Ware!" | Keyakizaka46 | [12] |
| March 26 | "Jabaja" | AKB48 | [13] |
| April 2 | "Hare Hare Carnival" | Matsuri nine. | [14] |
| April 9 | "Paint It Black" | BiSH | [15] |
| April 16 | "Yokubomono" | NMB48 | [16] |
| April 23 | "Haru wa Dokokara Kurunoka?" | NGT48 | [17] |
| April 30 | "Ask Yourself" | KAT-TUN | [18] |
| May 7 | "Synchronicity" | Nogizaka46 | [19] |
| May 14 | "Hayaokuri Calendar" | HKT48 | [20] |
| May 21 | "Shinkarion" | Boys and Men | [21] |
| May 28 | "Wake Me Up" | Twice | [22] |
| June 4 | "Cinderella Girl" | King & Prince | [23] |
| June 11 | "Teacher Teacher" | AKB48 | [24] |
| June 18 | "Innocent Days" | Sexy Zone | [25] |
| June 25 | "Are you Happy? / A gonna" | Morning Musume '18 | [26] |
| July 2 | "SUMMER LOVE" | MAG!C☆PRINCE | [27] |
| July 9 | "BLUE" | NEWS | [28] |
| July 16 | "Ikinari PUNCH LINE" | SKE48 | [29] |
| July 23 | "LOVE" | Kis-My-Ft2 | [30] |
| July 30 | "Gyakuten Lovers" | KEN☆Tackey | [31] |
| August 6 | "Natsu Hayate" | Arashi | [32] |
| August 13 | "COSMIC☆HUMAN" | Hey! Say! JUMP | [33] |
| August 20 | "Jikochu de ikou!" | Nogizaka46 | [34] |
| August 27 | "Ambivalent" | Keyakizaka46 | [35] |
| September 3 | "one more purple funk... -Komei katana-" | ENDRECHERI | [36] |
| September 10 | "JOY shitai Kimochi" | A.B.C-Z | [37] |
| September 17 | "Koko ni" | Kanjani Eight | [38] |
| September 24 | "Ikiro" | NEWS | [39] |
| October 1 | "Sentimental Train" | AKB48 | [40] |
| October 8 | "Yeah Yeah Yeah/Akogare no Stress-free/Hana, Takenawa no Toki" | Hello! Project All Stars | [41] |
| October 15 | "Kimi, Boku." | Kis-My-Ft2 | [42] |
| October 22 | "Memorial" | King & Prince | [43] |
| October 29 | "Boku Datte Naichau yo" | NMB48 | [44] |
| November 5 | "Kimi no Uta" | Arashi | [45] |
| November 12 | "Flamingo/TEENAGE RIOT" | Kenshi Yonezu | [46] |
| November 19 | "FAKE LOVE/Airplane pt.2" | BTS | [47] |
| November 26 | "Kaerimichi wa Tōmawari Shitaku Naru" | Nogizaka46 | [48] |
| December 3 | "Jealous" | TVXQ | [49] |
| December 10 | "No Way Man" | AKB48 | [50] |
| December 17 | "Karakuri Darake no Tenderness/Suppin KISS" | Sexy Zone | [51] |
| December 24 | "Stand by You" | SKE48 | [52] |
| December 31 | "Aitai, Aitai, Aenai." | KinKi Kids | [53] |