William Reginald Courtenay, 11th Earl of Devon PC (14 April 1807 18 November 1888), styled Lord Courtenay between 1835 and 1859, was a British politician who served as Chancellor of the Duchy of Lancaster from 1866 to 1867 and as President of the Poor Law Board from 1867 to 1868.Devon was the eldest son of William Courtenay, 10th Earl of Devon and his first wife Harriet Leslie Pepys, daughter of Sir Lucas Pepys, 1st Baronet. He was educated at Westminster School and at Christ Church, Oxford, and was called to the Bar, Lincoln's Inn, in 1832.