Viscount Downe is a title that has been created twice in the Peerage of Ireland. The first creation came in 1675 for William Ducie. However, the title became extinct on his death in 1679. The second creation came in 1680 for John Dawnay. He had earlier represented Yorkshire and Pontefract in the English House of Commons. His son, the second Viscount, also represented these constituencies in the House of Commons. His grandson, the third Viscount, sat as a Member of Parliament for Yorkshire but died from wounds received at the Battle of Campen in 1760. He was succeeded by his younger brother, the fourth Viscount, who represented Cirencester and Malton in Parliament.