The title Baron Percy has been created several times in the Peerage of England. The first, in 1066, became extinct in 1299. The second, in 1299, became extinct in 1517. The third, in 1557, became extinct in 1670. The present creation was in 1722, by writ of summons.

Barons Percy, 1st creation (1066)

• William de Percy, 1st Baron Percy (d. 1096)
• Alan de Percy, 2nd Baron Percy (ca. 1069-1135)
• William de Percy, 3rd Baron Percy (d. ca. 1150)
• William de Percy, 4th Baron Percy (1112-1175)
• Richard de Percy, 5th Baron Percy (d. 1198)
• William de Percy, 6th Baron Percy (1193-1245)
• Henry de Percy, 7th Baron Percy (1228-1272
• Henry de Percy, 8th Baron Percy (1273-1314) (1299 created Baron Percy of Alnwick)

Barons Percy (of Alnwick), 2nd creation (1299)

• Henry de Percy, 1st Baron Percy (1273-1314)
• Henry de Percy, 2nd Baron Percy (1300-1351)
• Henry de Percy, 3rd Baron Percy (1320-1368)
• Henry Percy, 4th Baron Percy (1341-1408) (1377 created (1st) Earl of Northumberland)

until 1527 see: Earl of Northumberland (2nd to 5th)

Barons Percy (of Alnwick), 3rd creation (1557)

see Earl of Northumberland, 7th - 11th

Barons Percy, 4th creation (1722)

• Algernon Seymour, 1st Baron Percy, 7th Duke of Somerset (1684-1750)
• Elizabeth Seymour, 2nd Baroness Percy (1716-1776)
• Hugh Percy, 3rd Baron Percy, 2nd Duke of Northumberland (1742-1817)
• Hugh Percy, 4th Baron Percy, 3rd Duke of Northumberland (1785-1847)
• Algernon Percy, 5th Baron Percy, 4th Duke of Northumberland (1792-1865)
• John James Hugh Henry Stewart-Murray, 6th Baron Percy, 7th Duke of Atholl (1840-1917)
• John George Stewart-Murray, 7th Baron Percy, 8th Duke of Atholl (1871-1942)
• James Thomas Stewart-Murray, 8th Baron Percy, 9th Duke of Atholl (1879-1957)
• Hugh Algernon Percy, 9th Baron Percy, 10th Duke of Northumberland (1914-1988)
• Henry Alan Walter Richard Percy, 10th Baron Percy, 11th Duke of Northumberland (1953-1995)
• Ralph George Algernon Percy, 11th Baron Percy, 12th Duke of Northumberland (b. 1956)