Viscount Hampden is a title that has been created twice, once in the Peerage of Great Britain and once in the Peerage of the United Kingdom. The first creation came in the Peerage of Great Britain in 1776 for the diplomat and politician Robert Hampden, 4th Baron Trevor. The title of Baron Trevor, of Bromham, had been created in the Peerage of Great Britain in 1712 for his father, the lawyer Sir Thomas Trevor. Both titles became extinct in 1824 on the death of the first Viscount's second son, the third Viscount. The family seat is Glynde Place, near Lewes, Sussex.