This is a list of the best-selling singles in 2018 in Japan, physical and digital sales are taken from Oricon yearly chart.[1][2]
| Ranking | Single | Artist | Physical | Digital | TOTAL |
|---|---|---|---|---|---|
| 1 | "Lemon" | Kenshi Yonezu | 382,896 | 1,796,953 | 2,179,849 |
| 2 | "Teacher Teacher" | AKB48 | 1,819,237 | 1,819,237 | |
| 3 | "Sentimental Train" | AKB48 | 1,471,958 | 1,471,958 | |
| 4 | "Synchronicity" | Nogizaka46 | 1,306,247 | 1,306,247 | |
| 5 | "Jikochu de Ikō!" | Nogizaka46 | 1,281,625 | 1,281,625 | |
| 6 | "No Way Man" | AKB48 | 1,213,501 | 1,213,501 | |
| 7 | "Jabaja" | AKB48 | 1,172,399 | 1,172,399 | |
| 8 | "Kaerimichi wa Tōmawari Shitaku Naru" | Nogizaka46 | 1,160,784 | 1,160,784 | |
| 9 | "Glass wo Ware!" | Keyakizaka46 | 1,021,450 | 133,375 | 1,154,825 |
| 10 | "Ambivalent" | Keyakizaka46 | 970,268 | 970,268 | |
| 11 | "Cinderella Girl" | King & Prince | 688,112 | 688,112 | |
| 12 | "U.S.A." | Da Pump | 541,356 | 541,356 | |
| 13 | "Natsu Hayate" | Arashi | 538,150 | 538,150 | |
| 14 | "Doraemon" | Gen Hoshino | 192,701 | 283,746 | 476,447 |
| 15 | "Fake Love/Airplane pt.2" | BTS | 471,083 | 471,083 | |
| 16 | Flamingo/Teenage Riot | Kenshi Yonezu | 259,490 | 209,085 | 468,575 |
| 17 | "Memorial" | King & Prince | 451,851 | 451,851 | |
| 18 | "Find the Answer" | Arashi | 439,525 | 439,525 | |
| 19 | "Mabataki" | Back Number | 434,455 | 434,455 | |
| 20 | "Ikinari Punch Line" | SKE48 | 390,770 | 390,770 | |
| 21 | "Muishiki no Iro" | SKE48 | 386,683 | 386,683 | |
| 22 | "Loser" | Kenshi Yonezu | 382,506 | 382,506 | |
| 23 | "Idea" | Gen Hoshino | 374,465 | 374,465 | |
| 24 | "Wake Me Up" | Twice | 354,088 | 354,088 | |
| 25 | "Candy Pop" | Twice | 340,992 | 340,992 | |
| 26 | "Warotapy Po" | NMB48 | 338,133 | 338,133 | |
| 27 | "White Love" | Hey! Say! JUMP | 320,310 | 320,310 | |
| 28 | "Ai no Katachi" | Misia ft. Greeeen | 298,189 | 298,189 | |
| 28 | "Boku Datte naichau yo" | NMB48 | 290,563 | 290,563 | |
| 30 | "Uchiage Hanabi" | Daoko with Kenshi Yonezu | 286,771 | 286,771 | |
| Blank means no respective version or didn't chart. | |||||