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Events from the year 1864 in Denmark.
|See also:||Other events of 1864|
List of years in Denmark
- 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.
- 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.
- 9 February – August Hassel, sculptor (died 1942)
- 6 May – Jens Christian Kofoed, architect (died 1941)
- 15 May – Vilhelm Hammershøi, painter (died 1916)
- 23 May – Louis Glass, composer (died 1936)
- 12 July – Carl Brummer, architect (died 1953)
- 15 November – Sophus Falck, manufacturer and founder of Falck (died 1926)
- "Christian IX | king of Denmark". Encyclopedia Britannica. Retrieved 17 June 2019.