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The title of 'Earl of Ulster' has been created several times in the Peerages of Ireland and the United Kingdom. Currently, the title is a subsidiary title of the Duke of Gloucester, and is used as a courtesy title by the Duke's son, Alexander Windsor, Earl of Ulster.
==Earls of Ulster, Peerage of Ireland, First Creation (1205)==

★ Hugh de Lacy, 1st Earl of Ulster (1176-1243)
==Earls of Ulster, Peerage of Ireland, Second Creation (1264)==

★ Walter de Burgh, 1st Earl of Ulster (d.1271)

★ Richard Og de Burgh, 2nd Earl of Ulster (1259-1326)

★ William Donn de Burgh, 3rd Earl of Ulster (1312-1333)

★ Elizabeth de Burgh, Duchess of Clarence, 4th Countess of Ulster (d.1363)

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★ m. Lionel of Antwerp, 1st Duke of Clarence, ''jure uxoris'' Earl of Ulster (1338-1368)

★ Philippa Plantagenet, Countess of March, 5th Countess of Ulster (1355-1382)

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★ m. Edmund Mortimer, 3rd Earl of March, ''jure uxoris'' Earl of Ulster (1352-1381)

★ Roger Mortimer, 4th Earl of March and 6th Earl of Ulster (1374-1398)

★ Edmund Mortimer, 5th Earl of March and 7th Earl of Ulster (1391-1425)

★ Richard Plantagenet, 3rd Duke of York, 8th Earl of Ulster (1412-1460)

★ Edward Plantagenet, 4th Duke of York, 9th Earl of Ulster (1442-1483), merged in crown 1461
==Earls of Ulster, Peerage of Ireland, Third Creation (1659)==

★ James Stuart, Duke of York and Albany (1633-1701), merged in crown 1685
==Earls of Ulster, Peerage of Ireland, Fourth Creation (1716)==

★ Ernest Augustus of Brunswick-Lüneburg, Duke of York and Albany (1674-1728)
==Earls of Ulster, Peerage of Ireland, Fifth Creation (1760)==

★ Prince Edward Augustus, Duke of York and Albany (1739-1767)
==Earls of Ulster, Peerage of Ireland, Sixth Creation (1784)==

★ Prince Frederick, Duke of York (1763-1827)
==Earls of Ulster, Peerage of the United Kingdom, First Creation (1866)==

★ Prince Alfred, Duke of Edinburgh (1844-1900)
==Earls of Ulster, Peerage of the United Kingdom, Second Creation (1928)==

★ Prince Henry, Duke of Gloucester (1900-1974)

★ Prince Richard, Duke of Gloucester (b.1944)