1866 in Denmark

Events from the year 1866 in Denmark.

Incumbents

 * Monarch – Christian IX
 * Prime minister – C. E. Frijs

Events

 * 22 August – SS Ottawa departs from Copenhagen as the first emigration ship between Copenhagen and New York City.
 * 7 September – The engagement of Princess Dagmar and Grand Duke Alexander Alexandrovich is celebrated at the royal court at Christiansborg Palace.
 * 22 September – Princess Dagmar leaves Copenhagen on board the steam ship Slesvig.

January–March

 * 1 January – Peter Elfelt, photographer (died 1931)
 * 19 January – Carl Theodor Zahle, politician (died 1946)
 * 16 February – Charles Brun, politician (died 1919)
 * 25 February – Hans Peter Prior, industrialist (died 1936)

April–June

 * 5 May – Thomas B. Thrige, industrialist (died 1938)
 * 19 June – Sabine Helms, botanist (died 1929)

July–September

 * 3 July – Albert Gottschalk, painter (died 1906)
 * 15 July – Adolph Jensen, economist and statistician (died 1948)
 * 31 August – Georg Jensen, goldsmith, designer (died 1935)

October–December

 * 9 November – Georg Carl Amdrup, admiral, polar explorer (died 1947)
 * 6 October – Nina Bang, politician (died 1928)
 * 2 December – Holger Nielsenm fencer (died 1955)

Deaths

 * 16 December – Christian Albrecht Bluhme, politician, prime minister of Denmark (born 1794)