← 1863 1862 1861 1864 in Denmark → 1865 1866 1867
Decades:	1840s 1850s 1860s 1870s 1880s
See also:	Other events of 1864 List of years in Denmark

Events from the year 1864 in Denmark.

Incumbents

• Monarch – Christian IX^[1]
• Prime minister – Ditlev Gothard Monrad (until 11 July), Christian Albrecht Bluhme

Events

• 1 February – The Second Schleswig War breaks out after the First Schleswig War had left the Schleswig-Holstein Question unsettled when Treussia-Austria crosses the River Eider with 57,000 soldiers.
• February
  • It soon results in the Evacuation of Danevirke.
  • The Battle of Sankelmark, a minor battle which occurs at Sankelmark, on the road between Schleswig and Flensburg, during the Danish retreat from Danevirke.
• 17 March – The Battle of Jasmund near the Prussian island of Rügen results in a tactical Danish victory.

• 17 and 18 April – Denmark suffers a severe defeat to the German Confederation in the Battle of Dybbøl which effectively decides the war.
• 9 May – Denmark wins a tactical victory in the Battle of Heligoland but it has no impact on the outcome of the war.
• 12 May – A general armistice came into effect, Denmark has lost the war.
• 29 June – In the Battle of Als, the last major engagement of the war, the Prussians secure Als after a night attack masterminded by the Chief of Staff Leonhard Graf von Blumenthal,
• 3 July – The Battle of Lundby in north-eastern Himmerland results in great Danish losses. It becomes the last battle of the Second Schleswig War.
• 8 July – The Cabinet of Monrad is succeeded by the Cabinet of Bluhme.
• 30 October – The Second Schleswig War ends. The Duchies of Schleswig, Holstein and Lauenburg are ceded to Prussia.

Undated

Births

January—March

• 9 February – August Hassel, sculptor (died 1942)

April–June

• 10 April – Clara Lachmann, Danish-Swedish patron of the arts (d. 1920)^[2]
• 6 May – Jens Christian Kofoed, architect (died 1941)
• 15 May – Vilhelm Hammershøi, painter (died 1916)
• 23 May – Louis Glass, composer (died 1936)
• 14 June – Niels Viggo Ussing, mineralogist (died 1911)

July–September

• 12 July – Carl Brummer, architect (died 1953)
• 16 August – Kristian Hude, photographer (died 1929)
• 1 September – Albert Edvard Wang , painter (died 1930)

October–December

• 15 November – Sophus Falck, manufacturer and founder of Falck (died 1926)

Deaths

January–March

• 15 February – Adam Wilhelm Moltke, landowner and politician (born 1785)
• 28 March – Princess Louise Charlotte, princess of Denmark (born 1789)

July–September

• 14 August – Christopher Puggaard, geologist (born 1823)
• 7 September - Gustav Friedrich Hetsch, architect (born 1788)

October–December

• 20 October – Carl Christian Rafn, historian, translator and antiquarian (born 1795)
• 17 November – Peter Christian Knudtzon, businessman (born 1789)