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 1604 to 1614. In 1613, he was raised to the Peerage of Ireland as Baron Chichester, of Belfast in County Antrim. He died childless in 1625 when the barony became extinct.