# List of Oricon number-one singles of 1984

The highest-selling singles in Japan are ranked in the Oricon Singles Chart, which is published by Oricon Style magazine. The data are compiled by Oricon based on each singles' physical sales. This list includes the singles that reached the number one place on that chart in 1984.

## Oricon Weekly Singles Chart

| Issue date | Song | Artist(s) |
| January 2 | "Moshimo Ashita ga... [ja]" | Warabe |
| January 9 | "Moshimo Ashita ga... [ja]" | Warabe |
| January 16 | "Moshimo Ashita ga... [ja]" | Warabe |
| January 23 | "Moshimo Ashita ga... [ja]" | Warabe |
| January 30 | "Moshimo Ashita ga... [ja]" | Warabe |
| February 6 | "Moshimo Ashita ga... [ja]" | Warabe |
| February 13 | "Rock'n Rouge [ja]" | Seiko Matsuda |
| February 20 | "Rock'n Rouge [ja]" | Seiko Matsuda |
| February 27 | "Rock'n Rouge [ja]" | Seiko Matsuda |
| March 5 | "Rock'n Rouge [ja]" | Seiko Matsuda |
| March 12 | "Ichiban Yarō [ja]" | Masahiko Kondō |
| March 19 | "Wine Red no Kokoro [ja]" | Anzen Chitai |
| March 26 | "Wine Red no Kokoro [ja]" | Anzen Chitai |
| April 2 | "Nagisa no Haikara Ningyo / Kaze no Magical [ja]" | Kyōko Koizumi |
| April 9 | "Katsu! [ja]" | Shibugakitai |
| April 16 | "Katsu! [ja]" | Shibugakitai |
| April 23 | "Southern Wind" | Akina Nakamori |
| April 30 | "Southern Wind" | Akina Nakamori |
| May 7 | "Southern Wind" | Akina Nakamori |
| May 14 | "Kanashikute Jealousy [ja]" | The Checkers |
| May 21 | "Jikan no Kuni no Alice / Natsu Fuku no Eve [ja]" | Seiko Matsuda |
| May 28 | "Jikan no Kuni no Alice / Natsu Fuku no Eve [ja]" | Seiko Matsuda |
| June 4 | "Kishidō [ja]" | Toshihiko Tahara |
| June 11 | "Kishidō [ja]" | Toshihiko Tahara |
| June 18 | "Kejime Nasai [ja]" | Masahiko Kondō |
| June 25 | "Kejime Nasai [ja]" | Masahiko Kondō |
| July 2 | "Meikyū no Andorōra / Dunk [ja]" | Kyōko Koizumi |
| July 9 | "Meikyū no Andorōra / Dunk [ja]" | Kyōko Koizumi |
| July 16 | "Amaoto wa Chopin no Shirabe [ja]" | Asami Kobayashi |
| July 23 | "Amaoto wa Chopin no Shirabe [ja]" | Asami Kobayashi |
| July 30 | "Amaoto wa Chopin no Shirabe [ja]" | Asami Kobayashi |
| August 6 | "Jukkai (1984)" | Akina Nakamori |
| August 13 | "Pink no Mozart [ja]" | Seiko Matsuda |
| August 20 | "Ao ni Kaita Ren'ai Shōsetsu [ja]" | Toshihiko Tahara |
| August 27 | "Jukkai (1984)" | Akina Nakamori |
| September 3 | "Hoshikuzu no Stage [ja]" | The Checkers |
| September 10 | "Hoshikuzu no Stage [ja]" | The Checkers |
| September 17 | "Hoshikuzu no Stage [ja]" | The Checkers |
| September 24 | "Eien ni Himitsu sa" (永遠に秘密さ) | Masahiko Kondō |
| October 1 | "Yamato Nadeshiko Shichi Henge [ja]" | Kyōko Koizumi |
| October 8 | "Yamato Nadeshiko Shichi Henge [ja]" | Kyōko Koizumi |
| October 15 | "Yamato Nadeshiko Shichi Henge [ja]" | Kyōko Koizumi |
| October 22 | "Tengoku ni Ichiban Chikai Shima [ja]" | Tomoyo Harada |
| October 29 | "Koibito-tachi no Pavement [ja]" | The Alfee |
| November 5 | "Woman "W no Higeki" Yori [ja]" | Hiroko Yakushimaru |
| November 12 | "Heart no Earring [ja]" | Seiko Matsuda |
| November 19 | "Heart no Earring [ja]" | Seiko Matsuda |
| November 26 | "Kazari ja Nai no yo Namida wa" | Akina Nakamori |
| December 3 | "Julia ni Shōshin [ja]" | The Checkers |
| December 10 | "Julia ni Shōshin [ja]" | The Checkers |
| December 17 | "Julia ni Shōshin [ja]" | The Checkers |
| December 24 | "Julia ni Shōshin [ja]" | The Checkers |
| December 31 | "The Stardust Memory [ja]" | Kyōko Koizumi |