Major-General Sir Ralph Bignell Ainsworth, CB, DSO, OBE, KStJ (20 September 1875 – 27 January 1952)[1] was a British physician, surgeon, and British Army officer. From 1930 to 1935, he was Commandant of the Royal Army Medical College. During World War II, he served as Director of Medical Services of the Joint War Organization (formed by the British Red Cross Society and the Order of St John).[2][3]