1865 in Denmark

Incumbents

• Monarch - Christian IX
• Prime minister - Christian Albrecht Bluhme, C. E. Frijs

Events

• 6 April – Hans Christian Andersens romantic comedy When the Spaniards Were Here premiers at the Royal Danish Theatre.
• 31 May 14 June It is possible for the public to see Constantin Hansen's monumental painting of The Danish Constituent Assembly in Alfred Hage's home in the Harsdorff House on Kongens Nytorv in Copenhagen. The entrance fee goes to veterans of the Second Schleswig War.
• 17 June A fire breaks out in the eastern part of Nørresundby and ends up destroying much of the town.
• 27 September A deputation from Sleswig visits Copenhagen.

Births

• 9 June – Carl Nielsen, composer

Undated

• Pauline Schmidt, magician

Deaths

• 7 April - Carl Dahl, painter
• 16 May – Anne Marie Mangor, cookbook writer
• 21 May - Christian Jürgensen Thomsen, archaeologist and arts administrator
• 16 September - Christian de Meza, commander of the Danish Army
• 14 December - Johan Georg Forchhammer, mineralogist and geologist