Leila Alice Denmark, MD (née Daughtry; February 1, 1898 – April 1, 2012) was an American pediatrician. She was the world's oldest practicing pediatrician until her retirement in May 2001 at the age of 103. She was a supercentenarian, living to be 114. On December 10, 2011, at age 113 years 312 days, she became one of the 100 oldest people ever. At her death she was the 4th-oldest verified living person in the world and the 3rd-oldest verified living person in the United States.

Born in Portal, Georgia, Denmark was the third of 12 children born to Elerbee and Alice Cornelia Hendricks Daughtry. Her paternal uncle was Missouri Congressman James Alexander Daugherty. She attended Tift College in Forsyth, Georgia, where she trained to be a teacher, but decided to attend medical school when her fiancé, John E. Denmark (1899–1990) was posted to Java, Dutch Indies, by the United States Department of State and no wives were allowed. She was the only woman in the 1928 graduating class of the Medical College of Georgia, and married soon after graduation. Denmark is credited as co-developer of the pertussis (whooping cough) vaccine in the 1920s and 1930s. For this, she was awarded the Fisher Prize in 1935.

The Kingdom of Denmark (Danish: Kongeriget Danmark, pronounced [ˈkɔŋəʁiːəð ˈdanmɑɡ̊] ( listen)) is a constitutional monarchy and sovereign state consisting the country of Denmark in northern Europe and two autonomous constituent countries, the Faroe Islands in the North Atlantic and Greenland in North America. The kingdom is a unitary state with some power being devolved from Denmark proper to Greenland and the Faroe Islands; this polity is referred to as the Danish Realm. Denmark proper is the hegemonial area, where judicial, executive, and legislative power resides. The Faroe Islands are defined to be a community of people within the kingdom, and the Greenlandic people are defined as a separate people with the right to self-determination.

Denmark is the southernmost of the Nordic countries, located southwest of Sweden and south of Norway, and bordered to the south by Germany. The country consists of a large peninsula, Jutland and many islands, most notably Zealand, Funen, Lolland, Falster and Bornholm, as well as hundreds of minor islands often referred to as the Danish Archipelago.