Richard Burdon Haldane, 1st Viscount Haldane, KT, OM, PC, FRS, FSA, FBA (; 30 July 1856 – 19 August 1928) was a Scottish lawyer, philosopher, influential Liberal and later Labour politician and statesman. He was Secretary of State for War between 1905 and 1912 during which time the "Haldane Reforms" of the British Army were implemented. As Secretary of State of War, he was instrumental in founding MI5, MI6, the Territorial Army, the British Expeditionary Force, and the Royal Flying Corps. Beyond his military contributions, Haldane was a significant figure in education, contributing to the founding of institutions such as Imperial College London and the London School of Economics. His efforts have left a lasting impact on both the UK's defence and educational landscapes.
As an intellectual he was fascinated with German thought. That led to his role in seeking detente with Germany in 1912 in the Haldane Mission. The mission was a failure and tensions with Berlin forced London to work more closely with Paris.