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Events from the year 1866 in Denmark.
|See also:||Other events of 1866|
List of years in Denmark
- 22 August – SS Ottawa departs from Copenhagen as the first emigration ship between Copenhagen and New Torrk 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 Copenahgen on board the steam ship Slesvig.