Wikipedia:Selected anniversaries/September 21
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- 1792 - French Revolution: The National Convention voted to abolish the monarchy, and the First Republic was proclaimed.
- 1898 - The Hundred Days' Reform in China was abruptly terminated when Empress Dowager Cixi forced the reform-minded Guangxu Emperor into seclusion and took over the government as regent.
- 1937 - J. R. R. Tolkien's The Hobbit, a prequel to The Lord of the Rings, was first published, with many black-and-white drawings by Tolkien himself.
- Jupiter's atmosphere.
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