These are the Oricon number one albums of 1998, per the Oricon Albums Chart.
Chart history
edit| † | Indicates best-selling album of 1998 |
| Issue Date | Album | Artist(s) |
|---|---|---|
| January 12 | Storytelling | Tomomi Kahala |
| January 19 | Works: The Best of TRF | TRF |
| January 26 | ||
| February 2 | Triple Joker | T.M. Revolution |
| February 9 | 181920 | Namie Amuro |
| February 16 | ||
| February 23 | Super Heroes | V6 |
| March 2 | Missing Place | Favorite Blue |
| March 9 | Heart | L'Arc-en-Ciel |
| March 16 | Punch Drunkard | The Yellow Monkey |
| March 23 | The Boøwy | Boøwy |
| March 30 | Deen Singles +1 | Deen |
| April 6 | Fake Fur | Spitz |
| April 13 | Love again | Globe |
| April 20 | Jet-CD | Puffy |
| April 27 | Time to Destination | Every Little Thing |
| May 4 | ||
| May 11 | Rise | Speed |
| May 18 | ||
| May 25 | Kumuiuta | Cocco |
| June 1 | B'z The Best "Pleasure" † | B'z |
| June 8 | ||
| June 15 | ||
| June 22 | ||
| June 29 | Smap 012 Viva Amigos | SMAP |
| July 6 | Umi no Yeah!! | Southern All Stars |
| July 13 | ||
| July 20 | Crimson | Nanase Aikawa |
| July 27 | Mother Father Brother Sister | Misia |
| August 3 | Shine | Luna Sea |
| August 10 | Pure Soul | Glay |
| August 17 | ||
| August 24 | B Album | KinKi Kids |
| August 31 | Mahō no Te | Tōko Furuuchi |
| September 7 | Cozy | Tatsuro Yamashita |
| September 14 | New Adventure | My Little Lover |
| September 21 | Mother Earth | Maki Ohguro |
| September 28 | B'z The Best "Treasure" | B'z |
| October 5 | ||
| October 12 | ||
| October 19 | Nagai Aida: Kiroro no Mori | Kiroro |
| October 26 | Samurai | Tsuyoshi Nagabuchi |
| November 2 | Sakura | Southern All Stars |
| November 9 | ||
| November 16 | Neue Muzik | Yumi Matsutoya |
| November 23 | ||
| November 30 | The #1's | Mariah Carey |
| December 7 | ||
| December 14 | Maximum Groove | MAX |
| December 21 | Relation | Globe |
| December 28 | Moment | Speed |
Trivia
edit- Number one album of 1998: B'z The Best "Pleasure" by B'z.
- Most weeks at number-one: B'z with a total of 7 weeks.