Sir William Francis Drummond Jervois, GCMG, CB (10 September 182117 August 1897) was a British military engineer and diplomat. After joining the British Army in 1839, he saw service, as a second captain, in South Africa. In 1858, as a major, he was appointed Secretary of a Royal Commission set up to examine the state and efficiency of British land-based fortifications against naval attack; and this led to further work in Canada and South Australia. From 1875 to 1888 he was, consecutively, Governor of the Straits Settlements, Governor of South Australia and Governor-General of New Zealand.