1860s|Monarch – Christian VIII
Prime minister – Otto Joachim
January 1 – An act establishes Copenhagen's municipal constitution (Københavns kommunale forfatning ). The 38 members of the City Council are to be elected by the citizens whereas the three mayors and the lord mayor are to be appointed by the king as has previous been the case.
April 9 – The first election for the new City Council is held. Only 1929 ´citizens, out of a population of about 121,000, are able to participate in the election due to heavy restrictions in the access to vote.
June 27 – The anointing of King Christian VIII at Frederiksberg Palace, the last such ceremony to take place in Denmark before it is abolished with the introduction of the Danish constitution in 1849.
September 8 – Søren Kierkegaard reveals his feelings for her to Regine Olsen
Peter Faber takes the first Danish photograph on record at Ulfeldts Plads in Copenhagen.
Historisk Tidsskrift, a Danish history journal, is established with Christian Molbech as its first editor.
June 10 – Theodor Philipsen, painter (died 1920)
September 5 – Troels Frederik Lund, historian (died 1921)
November 3 – Christian Fenger. Danish-American surgeon (died 1902)
December 17 – C. F. E. Horneman, composer (died 1906)
December 28 – Henning Matzen, politician (died 1910)
23 November – Christian Waagepetersen, wine merchant and philanthropist (born 1787)
1840 in Denmark Wikipedia
Events from the year 1840 in Denmark.