In the real world
- 16 March: Arrow Video releases The Invisible Man Appears and The Invisible Man vs. The Human Fly on Blu-ray together.
- 19 March: The first two episodes of Godzilla Singular Point premiere at a special screening in Tokyo; the first episode is streamed live on YouTube.
- 25 March: Godzilla Singular Point's first episode makes its Netflix premiere, exclusively in Japan. Toho Games releases Run Godzilla in most territories.
- 26 March: The third season of Godziban begins airing on YouTube.
- 30 March: Legendary Comics publishes Kong and Me.
- 31 March: Warner Bros. releases Godzilla vs. Kong to American theaters, concurrent with a one-month stint on HBO Max.
- 1 April: Godzilla Singular Point begins airing on Japanese television.
- 6 April: Legendary Comics publishes Godzilla Dominion and Kingdom Kong, Titan Books publishes Godzilla vs. Kong: The Official Movie Novelization and Insight Kids publishes Godzilla vs. Kong: Sometimes Friends Fight (But They Always Make Up).
- 14 April: Toho Games releases Godzilla Destruction in Australia and Canada.
- 21 April: IDW Publishing releases the first issue of Godzilla: Monsters & Protectors.
- 26 April: Toho Games releases Godzilla Battle Line in Canada and Australia.
- 27 April: Godzilla Destruction is released internationally.
- SRS Cinema releases Monster Seafood Wars to Blu-ray and VHS in late April.
- 21 May: Insight Editions publishes Godzilla vs. Kong: One Will Fall - The Art of the Ultimate Battle Royale.
- 24 June: Godzilla Singular Point is released on Netflix worldwide.
- 30 June: IDW Publishing releases the first issue of the quarterly series Godzilla Rivals.
- 2 July: Toho release Godzilla vs. Kong theatrically in Japan.
- 26 July: Arrow Video release the Blu-ray box set The Daimajin Trilogy (containing Daimajin, Return of Daimajin, and Wrath of Daimajin).
- 25 October: Astronomer Robert Hurt identifies a Godzilla-like nebula in the constellation of Sagittarius.
31 Mar. - Godzilla vs. Kong theatrical release poster
13 Aug. - The Great
Yokai War: Guardians
This is a list of references for 2021. 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: 
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