1645 in Denmark

Incumbents

• Monarch — Christian IV
• Steward of the Realm — Corfitz Ulfeldt

  Events

• March 3 — Simon Paulli gives his first public lecture in the new Domus Anatomica in Copenhagen.
• August 13 — 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.

  Births

Deaths

• January 31 — Hans Ulrik Gyldenløve, diplomat, illegitimate son of Christian IV