1645 in Denmark

Events from the year 1645 in Denmark.

Incumbents

 * Monarch &mdash; Christian IV
 * Steward of the Realm &mdash; Corfitz Ulfeldt

Events

 * 3 March &mdash; Simon Paulli gives his first public lecture in the new Domus Anatomica in Copenhagen.
 * 25 May – HDMS Stora Sofia sinks near Buskär outside the harbour of Gothenburg.
 * 13 August &mdash; The Second Treaty of Brömsebro is signed, putting an end to the Torstenson War. The island Øsel is ceded to Sweden.

Undated

 * Stephanius publishes Saxonis Grammatici Historiæ Danicæ Libri XVI, a Latin edition of Saxo Grammaticus's Gesta Danorum.

Art

 * Abraham Wuchters creates a full-length portrait of Ulrik Christian Gyldenløve.

Deaths

 * January 31 &mdash; Hans Ulrik Gyldenløve, diplomat, illegitimate son of Christian IV