Alexandrine Auguste of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952) was Queen of Denmark as the wife of King Christian X. She was also Queen of Iceland from 1 December 1918 to 17 June 1944.

She was born a Duchess of Mecklenburg-Schwerin, in the city of Schwerin, Germany. Her father was Frederick Francis III, Grand Duke of Mecklenburg-Schwerin; her mother was Grand Duchess Anastasia Mikhailovna of Russia, a granddaughter of Emperor Nicholas I of Russia.

Duchess Alexandrine married Prince Christian of Denmark on 26 April 1898, in Cannes, France, when she was 18 years old. They had two children:

She died in Copenhagen as Dowager Queen of Denmark in 1952 and is interred next to her husband in Roskilde Cathedral.

The only brother of Queen Alexandrine was Frederick Francis IV, Grand Duke of Mecklenburg-Schwerin, while her only sister was Duchess Cecilie of Mecklenburg-Schwerin, wife of German Crown Prince William, eldest son of German Emperor William II.

In 1902, the couple were given Marselisborg Palace, and the garden was to become one of her greatest interests. Alexandrine became crown princess in 1906 and queen in 1912. She is not considered to have played any political role, but is described as being a loyal support to her spouse.

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