1657 in Denmark

• Monarch – Frederick III^[1]
• Steward of the Realm – Joachim Gersdorff

• 14 August – The first execution at Nytorv in Copenhagen takes place.^[2]

• 1 December – Karen Brahe, book collector (born 1736)

Undated

• Hans Nobel, landowner and civil servant (died 1732)

• 13 February – Erik Juel, noble Privy Councillor (born 1591)
• 23 February – Erik Juel, statesman (born 1691)
• 29 April – Sophie Elisabeth Pentz, countess (born 1619)
• 10 November – Anders Bille, Marshal of the Realm (born 1600)

Undated

• c. 22 January – Niels Aagaard, librarian and scholar (born 1612)