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)
