Back 1821 en science French 1821 במדע HE 1821 a tudományban Hungarian Науката во 1821 година Macedonian Vitskap i 1821 NN Vitenskapsåret 1821 NB 1821 na ciência Portuguese 1821 год в науке Russian Vetenskapsåret 1821 Swedish 1821 nî kho-ha̍k ZH-MIN-NAN
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| 1821 in science |
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| Fields |
| Technology |
| Social sciences |
| Paleontology |
| Extraterrestrial environment |
| Terrestrial environment |
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The year 1821 in science and technology involved some significant events, listed below.