|Covid-19|Monarch – Charles XIV John
- Inauguration of the Carolina Rediviva
- Foundation of the Swedbank
- Nattvardsbarnen by Esaias Tegnér.
- Markalls sömnlösa nätter (1820–21) by Per Adam Wallmark.
- Runesvärdet av Karl August Nicander
- Senare dikter af Vitalis by Erik Sjöberg
6 October – Jenny Lind, opera singer (died 1887)
- Anna-Kajsa Norman, folk musician (died 1903)
- Kloka Anna i Vallåkra, religious visionary and natural healer (died 1896)
16 February – Georg Carl von Döbeln, war hero (born 1758)
25 May – Eric Ruuth, governor general (born 1746)
- Charlotte Du Rietz, love interest of Gustav III (born 1744)
1820 in Sweden Wikipedia
Events from the year 1820 in Sweden