1864 in Denmark

Events from the year 1864 in Denmark.

Incumbents

 * Monarch – Christian IX
 * 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.

January—March

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

April–June

 * 10 April – Clara Lachmann, Danish-Swedish patron of the arts (d. 1920)
 * 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)

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)