1864 in Denmark

• Monarch – Christian IX{{cite web |title=Christian IX {{!}} king of Denmark |url=https://www.britannica.com/biography/Christian-IX |website=Encyclopedia Britannica |access-date=17 June 2019 |language=en}}
• Prime minister – Ditlev Gothard Monrad (until 11 July), Christian Albrecht Bluhme

{{See also|Second Schleswig War#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.

File:Dybbol Skanse.jpg painted by Jørgen Valentin Sonne in 1871]]

• 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.

File:Louis Glass.gif]]

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

• 10 April – Clara Lachmann, Danish-Swedish patron of the arts (d. 1920){{Cite encyclopedia |year=1979 |title=Clara Lachmann |encyclopedia=Dictionary of Swedish National Biography |url=https://sok.riksarkivet.se/Sbl/Presentation.aspx?id=10817 |last=Kjellander |first=Rune |volume=22 |page=23 |language=sv}}
• 6 May – Jens Christian Kofoed, architect (died 1941)
• 15 May – Vilhelm Hammershøi, painter (died 1916)
• 23 May – Louis Glass, composer (died 1936)
• 14 June {{ndash}} Niels Viggo Ussing, mineralogist (died 1911)

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

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

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

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

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

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Category:1860s in Denmark

Denmark

Category:Years of the 19th century in Denmark