Juan Negrín López was a Spanish physician and politician who served as prime minister of the Second Spanish Republic. He was a leader of the Spanish Socialist Workers' Party and of the left-leaning Popular Front government during the Spanish Civil War. He also served as finance minister. He was the last Loyalist premier of Spain (1937–1939), leading the Republican forces defeated by the Nationalists under General Francisco Franco. He was President of the Council of Ministers of the Second Spanish Republic and the Spanish Republican government in exile between 1937 and 1945. He died in exile in Paris, France.

During the Spanish Civil War, several countries followed a principle of non-intervention to avoid any potential escalation or possible expansion of the war to other states. That would result in the signing of the Non-Intervention Agreement in August 1936 and the setting up of the Non-Intervention Committee, which first met in September. Primarily arranged by the French and the British governments, the committee also included the Soviet Union, Fascist Italy, and Nazi Germany. Ultimately, the committee had the support of 27 states.