Marquesses of Downshire (1789)
- Subsidiary titles: Earl of Hillsborough (created 1751 in the Peerage of Ireland and 1772 in the Peerage of Great Britain); Viscount Hillsborough (1717, Ireland); Viscount Kilwarlin (1751, Ireland); Viscount Fairford (1772, Great Britain); Baron Hill of Kilwarlin (1717, Ireland); Baron Harwich (1756, Ireland)
- Wills Hill, 1st Marquess of Downshire (1718–1793)
- Arthur Hill, 2nd Marquess of Downshire (1753–1801)
- Arthur Blundell Sandys Trumbull Hill, 3rd Marquess of Downshire (1788–1845)
- Arthur Wills Blundell Sandys Trumbull Windsor Hill, 4th Marquess of Downshire (1812–1868)
- Arthur Hill, Viscount Kilwarden (1841–1841)
- Arthur Wills Blundell Trumbull Sandys Roden Hill, 5th Marquess of Downshire (1844–1874)
- Arthur Wills John Wellington Trumbull Blundell Hill, 6th Marquess of Downshire (1871–1918)
- Arthur Wills Percy Wellington Blundell Trumbull Hill, 7th Marquess of Downshire (1894–1989)
- Arthur Robin Ian Hill, 8th Marquess of Downshire (1929–2003)
- Arthur Francis Nicholas Wills Hill, 9th Marquess of Downshire (b. 1959)
The heir apparent is the present holder's son Edmund Robin Arthur Hill, Earl of Hillsborough (b. 1996)
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