Events from the year 1843 in Denmark.

• Monarch – Christian VIII^[1]
• Prime minister – Poul Christian Stemann

• 18 May – first public meeting at Skamlingsbanken.
• 16 August – Georg Carstensen Tivoli Gardens in Copenhagen are inaugurated with 3,615 visitors on the opening day. At the end of the 1843 season, more than 175,000 guests have visited the park.^[2]
• 15 December – The Barony of Adelersborg is established by G.F.O. Zytphen-Adeler and Bertha Henriette Frederikke Løvenskiold from the manors of Dragsholm and Dønnerup.

• 20 February – Søren Kierkegaard publishes Either/Or,

• 24 January – Evald Tang Kristensen, author and folklore collector (died 1929)
• 25 February – Christian Ditlev Ammentorp Hansen, pharmacist and industrialist (died 1916)
• 31 March
  • Christian Zacho, painter (died 1913)
  • Kristian Zahrtmann, painter (died 1917)

• 8 April – Asger Hamerik, composer (died 1923)
• 3 June – King Frederick VIII (died 1912)^[3]

• 9 October – Christian Christiansen, physicist (died 1917)
• 7 November
  • Erhard Frederiksen, agriculturalist (died 1903)
  • Emil Vett, businessman (died 1911)

• 18 January – Princess Louise Auguste, princess of Denmark, Duchess of Augustenborg (born 1771)