• Sir
James Duff (British Army officer) (1752–1839), British army officer, who fought in the Napoleonic wars and a Member of Parliament •
James Grant Duff (1789–1858), Indian soldier and statesman •
James Duff (North Norfolk MP) (1831–1878), British MP for North Norfolk •
James Stoddart Duff (1856–1916), Canadian politician •
James Augustine Duff (1872–1943), Ulster Unionist politician in Northern Ireland •
James H. Duff (1883–1969), Pennsylvanian politician •
James Duff, 2nd Earl Fife (1729–1809), MP for Banffshire and Elginshire •
James Duff, 4th Earl Fife (1776–1857), MP for Banffshire •
James Duff, 5th Earl Fife (1814–1879), MP for Banffshire ==Others==