Lionel George Curtis (1875-1955) was a British political thinker and official, working as secretary to colonial administrator Lord Milner following the Second Boer War. Curtis was a key figure in ‘Milner’s Kindergarten’, an informal group of South African civil servants working toward a South African union and an Imperial Federation of the British Empire. In 1912 Curtis was appointed Beit Lecturer in Colonial History at the University of Oxford and, in 1919, established the Royal Institute of International Affairs.