The Marquess of Donegall is a title in the peerage of Ireland, created in 1791. The title is associated with the Donegall family, which has historical roots in Belfast and County Antrim. The family has played a significant role in the region's development, particularly during the 19th century. The current holder of the title is the 9th Marquess of Donegall, who succeeded in 2021. The Marquessate is part of the Peerage of the United Kingdom and is linked to various estates and lands, including the Ballygally Castle in Northern Ireland. The title is hereditary, passed down through generations of the Donegall family.