• Monarch – Christian X^[1]
• Prime minister – Carl Theodor Zahle (until 30 March), Otto Liebe (until 5 April), Michael Pedersen Friis (until 5 May), Niels Neergaard

• 29 March – Christian X dismisses the elected government, a reserve power he had under the Danish Constitution, giving rise to the constitutional crisis known as the Easter Crisis.^[2]
• 4 April – The Easter Crisis ends with Christian X's dismissal of the Cabinet of Liebe.^[2]
• 26 September – The 50th birthday of Christian X is celebrated.

Date unknown edit

• B 1903 wins its first Danish football championship by defeating B 1901 2–0 in the final of the 1919–20 Danish National Football Tournament.

January–March edit

• 31 January – Albert Mertz, painter (died 1990)
• 26 February – Hilmar Baunsgaard, politician, former Danish prime minister (died 1989)

April–June edit

• 16 April – Prince Georg of Denmark (died 1986)
• 14 May – Knud Lundberg, football player (died 2002)
• 22 May – Jorgen Thalbitzer pilot (died 1843)
• 18 June – Grete Jalk, furniture designer (died 2006)

July–September edit

• 28 August – Keld Helmer-Petersen, photographer (died 2013)

October–December edit

• 6 November – Dagmar Andreasen, businesswoman (died 2006)
• 13 November – Inge Krogh, politician (died 2023)
• 6 December – Mette Koefoed Bjørnsen, author, conciliator and economist (died 2008)^[3]
• 10 December – Ragnhild Hveger, swimmer (died 2011)

January–March edit

• 6 January – Hieronymus Georg Zeuthen , mathematician (born 1839)
• 3 March – Theodor Philipsen, painter (born 1840)
• 7 March – Sophus Christopher Hauberg, industrialist (born 1848)
• 14 March – Christian Blache, painter (born 1839)
• 23 March – Ivar Knudsen, engineer (born 1861)
• 15 April – Hans Peter Johan Lyngbye (born 1834)

April–June edit

• 27 June – Hack Kampmann, architect (born 1856)