Marquess of Donegall is a title in the Peerage of Ireland held by the head of the Chichester family, originally from Devon, England. Sir John Chichester sat as a Member of Parliament and was High Sheriff of Devon in 1557. One of his sons, Sir Arthur Chichester, was Lord Deputy of Ireland from 1605 to 1616. In 1613, he was raised to the Peerage of Ireland as Baron Chichester, of Belfast in County Antrim. When he died childless in 1625 the barony became extinct.