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 1980.
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 7 | "Ihōjin " | Sayuri Kume | [1] |
| January 28 | "Daitokai " | Crystal King | |
| March 10 | "Okuru Kotoba " | Kaientai | |
| April 21 | "Runaway " | Chanels | |
| June 9 | "Dancing All Night " | Monta & Brothers | |
| August 18 | "Junko / Namida no Serenade " | Tsuyoshi Nagabuchi | |
| September 29 | "Hatto Shite! Good " | Toshihiko Tahara | |
| October 13 | "Kaze wa Aki Iro / Eighteen " | Seiko Matsuda | |
| November 17 | "I'm In the Mood for Dancing" Japanese title: "Dancing Sister" (ダンシング・シスター) | The Nolans | |
| December 1 | "Koibito yo " | Mayumi Itsuwa | |
| December 22 | "Sneaker Blues " | Masahiko Kondō | |
Toshinobu "Toshi" Kubota is a Japanese singer, songwriter, musician, music producer, and radio personality. He has produced six million-seller records and thirty-three Top 40 singles during his career. Kubota is currently part of Sony Music Japan. In addition, he has composed and written songs for many singers including Hiromi Iwasaki, Misia, Toshinori Yonekura, Kyōko Koizumi, and many other recording artists.
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