Margrethe II (Danish: [mɑˈkʁeˀtə]; Margrethe Alexandrine Þórhildur Ingrid, born 16 April 1940) is Queen of Denmark and commander-in-chief of the Danish Defence.Born into the House of Glücksburg, a cadet branch of the House of Oldenburg, Margrethe is the eldest child of Frederick IX of Denmark and Ingrid of Sweden. She became heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne. Margrethe succeeded her father upon his death on 14 January 1972. On her accession, she became the first female monarch of Denmark since Margrethe I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union. In 1967, she married Henri de Laborde de Monpezat, with whom she had two sons: Crown Prince Frederik and Prince Joachim.

Margrethe is known for her strong archaeological passion and has participated in several excavations, including in Italy, Egypt, Denmark and South America. She shared this interest with her grandfather Gustaf VI Adolf of Sweden, with whom she spent some time unearthing artefacts near Etruria in 1962.As of 2022, Margrethe has, as sovereign, received 42 official state visits and she has undertaken 55 foreign state visits herself. She and the royal family have made several other foreign visits. Support for the monarchy in Denmark has been and remains consistently high at around 82%, as does Margrethe's personal popularity.