List of best-selling singles in 1998 (Japan)
This is a list of the best-selling singles in 1998 in Japan, as reported by Oricon.
| Ranking | Single | Artist | Release | Sales |
| 1 | "Yuuwaku" | Glay | 1,612,000 | |
| 2 | "Yozora no Mukō" | SMAP | 1,571,000 | |
| 3 | "My Graduation" | Speed | 1,475,000 | |
| 4 | "Timing" | Black Biscuits | 1,451,000 | |
| 5 | "Soul Love" | Glay | 1,372,000 | |
| 6 | "Nagai Aida" | Kiroro | 1,182,000 | |
| 7 | "Honey" | L'Arc-en-Ciel | 1,173,000 | |
| 8 | "Aisareru yori Aishitai" | KinKi Kids | 1,135,000 | |
| 9 | "Time Goes By" | Every Little Thing | 1,132,000 | |
| 10 | "Zenbu Dakishimete" | KinKi Kids | 1,127,000 | |
| 11 | "Pink Spider" | hide with Spread Beaver | 1,033,000 | |
| 12 | "Ashita ga Kikoeru/Children's Holiday" | J-Friends | 1,021,000 | |
| 13 | "All My True Love" | Speed | 1,012,000 | |
| 14 | "Kasou" | L'Arc-en-Ciel | 1,009,000 | |
| 15 | "Snow Drop" | L'Arc-en-Ciel | 997,000 |