1820 in Denmark
Events from the year 1820 in Denmark. Incumbents
 Monarch – Frederick VI

Events

 1 May – Sparekassen for Kjøbenhavn og Omegn is established in Copenhagen. Undated
 Bella and Hanna. The Eldest Daughters of M. L. Nathanson is painted by Christoffer Wilhelm Eckersberg

Births
 28 January – Vilhelm Pedersen, artist, illustrator (died 1859)
 2 October  Georg Petersen, businessman (died 1900)<ref</ref>
 25 October  Lorenz Frølich, painter (died 1908)
 26 November
 Prince Frederick William of Hesse-Kassel (died 1884 in Germany)
 Johan Adam Schwartz, turner (died 1874)

Deaths
 1 March – Peter Christian Uldahl, piano maker (born 1779)
 13 April  Johan Ludvig Mansa, landscape architect (born 1740)
 19 April – Johan Ludvig Mansa, landscape architect (born 1740 in Zweibrücken)
 27 May – Jean-Françoìs de Dompierre de Jonquières, merchant, landowner and amateur artist (born 1775)
 30 July – Carl Adolph Castenschiold, landowner and chamberlain (born 1740)

References

 
1820s in Denmark
Denmark
Years of the 19th century in Denmark