List of Oricon number-one singles of 1985
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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 1985.
Oricon Weekly Singles Chart
| class="wikitable plainrowheaders" style="text-align: center"
!width="80"|Issue date !width="100"|Song !width="100"|Artist(s) !width="20"|Ref. |
| scope="row"|January 7
|rowspan="2"|"{{ill|The Stardust Memory|ja}}" |rowspan="2"|Kyōko Koizumi |
|---|
| scope="row"|January 14 |
| scope="row"|January 21
|rowspan="3"|"{{ill|You Gotta Chance: Dance de Natsu wo Dakishimete|ja|You Gotta Chance 〜ダンスで夏を抱きしめて〜}}" |rowspan="3"|Kōji Kikkawa |
| scope="row"|January 28 |
| scope="row"|February 4 |
| scope="row"|February 11
|rowspan="2"|"{{ill|Tenshi no Wink|ja|天使のウィンク}}" |rowspan="2"|Seiko Matsuda |
| scope="row"|February 18 |
| scope="row"|February 25
|rowspan="1"|"Yoisho!" (ヨイショッ!) |rowspan="1"|Masahiko Kondō |
| scope="row"|March 4
|rowspan="1"|"{{ill|Cinderella wa Nemurenai|ja|シンデレラは眠れない}}" |rowspan="1"|The Alfee |
| scope="row"|March 11
|rowspan="1"|"{{ill|Sotsugyō: Graduation|ja|卒業-GRADUATION-}}" |rowspan="1"|Momoko Kikuchi |
| scope="row"|March 18
|rowspan="2"|"Mi Amore (Meu amor é...)" |rowspan="2"|Akina Nakamori |
| scope="row"|March 25 |
| scope="row"|April 1
|rowspan="3"|"{{ill|Ano Ko to Scandal|ja|あの娘とスキャンダル}}" |rowspan="3"|The Checkers |
| scope="row"|April 8 |
| scope="row"|April 15 |
| scope="row"|April 22
|rowspan="2"|"{{ill|Tokonatsu Musume|ja|常夏娘}}" |rowspan="2"|Kyōko Koizumi |
| scope="row"|April 29 |
| scope="row"|May 6
|rowspan="1"|"{{ill|Nikumare Sōna New Face|ja|にくまれそうなNEWフェイス}}" |rowspan="1"|Kōji Kikkawa |
| scope="row"|May 13
|rowspan="1"|"Akaitori Nigeta" |rowspan="1"|Akina Nakamori |
| scope="row"|May 20
|rowspan="1"|"{{ill|Boy no Kisetsu|ja|ボーイの季節}}" |rowspan="1"|Seiko Matsuda |
| scope="row"|May 27
|rowspan="2"|"{{ill|Boy no Theme|ja|BOYのテーマ}}" |rowspan="2"|Momoko Kikuchi |
| scope="row"|June 3 |
| scope="row"|June 10
|rowspan="2"|"{{ill|Ima Dakara|ja|今だから}}" |rowspan="2"|Yumi Matsutoya, Kazumasa Oda, {{ill|Kazuo Zaitsu|ja|財津和夫}} |
| scope="row"|June 17 |
| scope="row"|June 24
|rowspan="1"|"{{ill|Debut / Manhattan Joke|ja|デビュー/MANHATTAN JOKE}}" |rowspan="1"|Naoko Kawai |
| scope="row"|July 1
|rowspan="1"|"Sand Beige (Sabaku e)" |rowspan="1"|Akina Nakamori |
| scope="row"|July 8
|rowspan="1"|"{{illm|Dancing Shoes (Seiko Matsuda song)|lt=Dancing Shoes|ja|DANCING SHOES}}" |rowspan="1"|Seiko Matsuda |
| scope="row"|July 15
|rowspan="3"|"{{ill|Ore-tachi no Rockabilly Night|ja|俺たちのロカビリーナイト}}" |rowspan="3"|The Checkers |
| scope="row"|July 22 |
| scope="row"|July 29 |
| scope="row"|August 5
|rowspan="1"|"{{illm|Majo (Kyōko Koizumi song)|lt=Majo|ja|魔女 (小泉今日子の曲)}}" |rowspan="1"|Kyōko Koizumi |
| scope="row"|August 12
|rowspan="2"|"{{ill|Kanashimi ni Sayonara|ja|悲しみにさよなら}}" |rowspan="2"|Anzen Chitai |
| scope="row"|August 19 |
| scope="row"|August 26
|rowspan="1"|"{{ill|Kareinaru Kake|ja|華麗なる賭け (田原俊彦の曲)}}" |rowspan="1"|Toshihiko Tahara |
| scope="row"|September 2
|rowspan="2"|"Kanashimi ni Sayonara" |rowspan="2"|Anzen Chitai |
| scope="row"|September 9 |
| scope="row"|September 16
|rowspan="2"|"{{ill|Namida no Jasmine Love|ja|涙の茉莉花LOVE}}" |rowspan="2"|Sonoko Kawai |
| scope="row"|September 23 |
| scope="row"|September 30
|rowspan="1"|"{{ill|Heart of Rainbow: Ai no Niji wo Watatte / Blue Pacific|ja|HEART OF RAINBOW 〜愛の虹を渡って〜/ブルー・パシフィック}}" |rowspan="1"|The Checkers |
| scope="row"|October 7
|rowspan="2"|"{{ill|Mō Aenai Kamo Shirenai|ja|もう逢えないかもしれない}}" |rowspan="2"|Momoko Kikuchi |
| scope="row"|October 14 |
| scope="row"|October 21
|rowspan="1"|"Solitude" |rowspan="1"|Akina Nakamori |
| scope="row"|October 28
|rowspan="2"|"{{ill|Koi ni Ochite: Fall in Love|ja|恋におちて -Fall in love-}}" |rowspan="2"|Akiko Kobayashi |
| scope="row"|November 4 |
| scope="row"|November 11
|rowspan="1"|"{{ill|Kami-sama Help!|ja|神様ヘルプ!}}" |rowspan="1"|The Checkers |
| scope="row"|November 18
|rowspan="2"|"Koi ni Ochite: Fall in Love" |rowspan="2"|Akiko Kobayashi |
| scope="row"|November 25 |
| scope="row"|December 2
|rowspan="1"|"{{ill|Nantettatte Idol|ja|なんてったってアイドル}}" |rowspan="1"|Kyōko Koizumi |
| scope="row"|December 9
|rowspan="2"|"Koi ni Ochite: Fall in Love" |rowspan="2"|Akiko Kobayashi |
| scope="row"|December 16 |
| scope="row"|December 23
|rowspan="1"|"Kamen Butōkai" |rowspan="1"|Shonentai |
| scope="row"|December 30
|rowspan="1"|"Koi ni Ochite: Fall in Love" |rowspan="1"|Akiko Kobayashi |