Helle Thorning-Schmidt is a Danish retired politician who served as the 26th Prime Minister of Denmark from 2011 to 2015, and Leader of the Social Democrats from 2005 to 2015. She is the first woman to have held each post. Following defeat in 2015, she announced that she would step down as both Danish Prime Minister and Social Democratic party leader. Ending her political career in April 2016, she was the chief executive of the NGO Save the Children until June 2019.

The prime minister of Denmark is the head of government in the Kingdom of Denmark comprising the three constituent countries: Denmark, Greenland and the Faroe Islands. Before the creation of the modern office, the kingdom did not initially have a head of government separate from its head of state, namely the monarch, in whom the executive authority was vested. The Constitution of 1849 established a constitutional monarchy by limiting the powers of the monarch and creating the office of premierminister. The inaugural holder of the office was Adam Wilhelm Moltke.