In the real world
- Yoshimitsu Banno becomes the managing director of Toho Eizo Bijutsu.
- Cosmo Clock 21, later featured in Godzilla vs. Mothra, is constructed, becoming the world's then-tallest Ferris wheel.
- The Toy Card card sets Godzilla Wars and Godzilla Wars 2 are released in Japan by IMS Co.
- 8 January: Akihito succeeds his late father, Hirohito, as Emperor of Japan. This officially begins the Heisei era.
- The first chapter of Gunhed, a manga adaptation of the upcoming movie, is published in the April issue of Newtype magazine.
- 28 May: The Legend of Dinosaurs episode of Mystery Science Theater 3000 airs on KTMA-TV, concluding the series' first season.
- The Gunhed manga concludes publication in the August issue of Newtype.
- 22 July: Gunhed is released in Japan. Its soundtrack is also released by Fun House.
- 10 August: Shooting of Godzilla vs. Biollante's special effects scenes begins.
- 18 August: Yuji Koseki, composer of "Mothra's Song," dies of a cerebral infarction at age 80.
- 20 September: Fuminori Ohashi passes away at age 74.
- 1 October: Brie Larson is born in California, USA.
- Godzilla: Monster of Monsters! is released in the United States.
- 6 November: Godzilla vs. Biollante's special effects unit wraps filming.
- 10 December: Godzilla vs. Biollante, a novelization of the upcoming movie, is published by Kadokawa.
- 16 December: Godzilla vs. Biollante is released in Japan.
- 21 December: The soundtrack to The Return of Godzilla, composed by Reijiro Koroku, is released by King Records.
- 25 December: Godzilla vs. Biollante Great Encyclopedia is published by Rippu Shobo.
- Godzilla is released from his imprisonment inside the crater of Mount Mihara by terrorists working for Bio-Major. A creature created from the combination of the DNA of Godzilla, a rose, and a scientist's deceased daughter, dubbed Biollante, attracts the King of the Monsters toward Lake Ashi. Before reaching the lake, Godzilla engages the JSDF's new weapon Super X2 at sea and forces it to withdraw. Godzilla defeats Biollante at Lake Ashi before assaulting Osaka, where he destroys the Super X2 but is successfully injected with the Anti-Nuclear Energy Bacteria. Godzilla engages Biollante again in a final confrontation at Wakasa Bay, where he is weakened by the effects of the ANEB and stumbles into the sea. Both monsters then go their separate ways: Godzilla out to sea, and Biollante into outer space. (Godzilla vs. Biollante)
- Gamera battles Gyaos, Jiger, Zigra, Guiron and Viras over the course of what is dubbed a "Monster Summer". (GAMERA -Rebirth-)
This is a list of references for 1989. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
- Matsunomoto, Kazuhiro; Kojima, Kazuhiro; Shimazaki, Jun; Tomoi, Kento; Taketomi, Gentaro; Ofuna, Ryuji (14 July 2014). Heisei Godzilla Chronicle (2nd ed.). Kinema Junpo. ISBN 978-4-87376-319-4.
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