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 de Burgh, 2nd Earl of Ulster (1259-1326)
• William de Burgh, 3rd Earl of Ulster (1312-1333)
• Elizabeth de Burgh, 4th Countess of Ulster (d.1363)
  • m. Lionel of Antwerp, Duke of Clarence (1338-1368)
• Philippa, Countess of Ulster and March (1355-1382)
• Roger Mortimer, 4th Earl of March, 6th Earl of Ulster (1374-1398)
• Edmund Mortimer, 5th Earl of March, 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)