Comprises:

'Olley, Charles', correspondence with Olley, President, White Rhodesia Council, and related papers, 1941-1957

'Orchardson, Ian Q.', correspondence with Orchardson, Kericho, Kenya, contributor to East Africa and Rhodesia, 1933-1935

'Orde-Browne, Major G[ranville]', correspondence with Orde-Browne, Labour Commissioner, Tanganyika (later Tanzania), and author of Here's How ((London: East Africa, 1938) and related papers, 1931-1947

'Ormsby-Gore, W.G.A., M.P.', correspondence with Ormsby-Gore, Under-Secretary of State for the Colonies, and related papers, 1924-1936

'O'Shea, T[homas] J.', correspondence with O'Shea, Kenya, contributor to East Africa and Rhodesia, 1937-1940

'Oversea Service', papers relating to the educational and training organisation, Oversea Service, 1955-1962