This is the list of number-one singles in Japan during 1990 according to Oricon Chart.[1]
| Issue Date | Song | Artist |
|---|---|---|
| January 1 | "Christmas Eve" (クリスマス・イブ) | Tatsuro Yamashita |
| January 8 | (No information) | |
| January 15 | "Christmas Eve" (クリスマス・イブ) | Tatsuro Yamashita |
| January 22 | "Kuchibiru Kara Biyaku" | Shizuka Kudo |
| January 29 | "Midnight Taxi" | Miho Nakayama |
| February 5 | "Aku no Hana" (悪の華) | Buck-Tick |
| February 12 | "Kuchibiru Kara Biyaku" | Shizuka Kudo |
| February 19 | "Kōya no Megaroporisu" (荒野のメガロポリス) | Hikaru Genji |
| February 26 | "No Titlist" | Rie Miyazawa |
| March 5 | "Kiss Me Now" (今すぐＫｉｓｓ Ｍｅ) | Lindberg |
| March 12 | "Miss Me!" (見逃してくれよ！) | Kyōko Koizumi |
| March 19 | "Kiss Me Now" (今すぐＫｉｓｓ Ｍｅ) | Lindberg |
| March 26 | "1990" | Complex |
| April 2 | "Kiss Me Now" (今すぐＫｉｓｓ Ｍｅ) | Lindberg |
| April 9 | "Sexy Music" | Wink |
| April 16 | ||
| April 23 | "Roman Hikō" (浪漫飛行) | Kome Kome Club |
| April 30 | "Oh Yeah!" | Princess Princess |
| May 7 | ||
| May 14 | "Sayonara Jinrui" (さよなら人類) | Tama |
| May 21 | "Senryū no Shizuku" | Shizuka Kudo |
| May 28 | "Jealousy o nemura sete" (ＪＥＡＬＯＵＳＹを眠らせて) | Kyosuke Himuro |
| June 4 | "Pure Gold" | Eikichi Yazawa |
| June 11 | "Jealousy o nemura sete" (ＪＥＡＬＯＵＳＹを眠らせて) | Kyosuke Himuro |
| June 18 | "Sayonara Jinrui" (さよなら人類) | Tama |
| June 25 | "Taiyō no Komachi Angel" (太陽のＫｏｍａｃｈｉ Ａｎｇｅｌ) | B'z |
| July 2 | "Nichiyōbi" (にちようび) | Jitterin' Jinn |
| July 9 | "Odoru Pompokolin" (おどるポンポコリン) | B.B.Queens |
| July 16 | "The Point of Lover's Night" | TM Network |
| July 23 | "Odoru Pompokolin" (おどるポンポコリン) | B.B.Queens |
| July 30 | "Dear Friend" | Akina Nakamori |
| August 6 | "Jōnetsu no bara" (情熱の薔薇) | The Blue Hearts |
| August 13 | "Dear Friend" | Akina Nakamori |
| August 20 | "Odoru Pompokolin" (おどるポンポコリン) | B.B.Queens |
| August 27 | "Cocoro" | Hikaru Genji |
| September 3 | "Odoru Pompokolin" (おどるポンポコリン) | B.B.Queens |
| September 10 | ||
| September 17 | ||
| September 24 | ||
| October 1 | "Watashi ni Tsuite" | Shizuka Kudo |
| October 8 | "Time to Countdown" | TMN |
| October 15 | "Easy Come, Easy Go!" | B'z |
| October 22 | ||
| October 29 | ||
| November 5 | "Itoshii Hitoyo Good Night…" (愛しい人よＧｏｏｄ Ｎｉｇｈｔ…) | |
| November 12 | "Emitteyo" (笑ってよ) | Hikaru Genji |
| November 19 | "Mizu ni Sashita Hana" (水に挿した花) | Akina Nakamori |
| November 26 | "Silent Eve" (サイレント・イヴ) | Midori Karashima |
| December 3 | "Julian" (ジュリアン) | Princess Princess |
| December 10 | "Silent Eve" (サイレント・イヴ) | Midori Karashima |
| December 17 | ||
| December 24 | "Ai wa Katsu" (愛は勝つ) | Kan |
| December 31 | ||