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| 1821 |
| | | French physicist Augustin Jean Fresnel publishes the theory that light is a transverse wave, thus explaining polarization effects | |
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| 1821 |
| | | Carl Maria von Weber's opera Der Freischutz has its premiere in Berlin | |
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| 1821 |
| | | San Martín enters Lima and proclaims Peruvian independence with himself as 'Protector' | |
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| 1821 |
| | | Bolívar defeats the Spanish at Carabobo and liberates, for the second time, his native city of Caracas | |
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| 1821 |
| | | English author William Hazlitt publishes Table Talk, a two-volume collection that includes most of his best-known essays | |
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| 1821 |
| | | A reactionary movement led by Agustín de Iturbide wins new and lasting independence for Mexico | |
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| 1821 |
| | | During his coronation George IV has the doors of Westminster Abbey closed against his queen, Caroline | |
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| c. 1821 |
| | | The Shaker settlements, now widespread in the US, form The United Society of Believers in Christ's Second Appearing | |
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| 1821 |
| | | The spoken language of the Cherokee Indians is captured in written form – an achievement traditionally attributed to Sequoyah | |
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| 1821 |
| | | The Saturday Evening Post is launched in Philadelphia as a weekly to provide light Sunday reading | |
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