Henry Percy, 3rd Baron Percy

Henry Percy, 3rd Baron Percy of Alnwick (c. 1321–1368), eldest son of the 2nd Baron and Idonia Clifford, was the father of two earls. He married Mary of Lancaster, daughter of Henry, 3rd Earl of Lancaster, and their sons were Henry, later 1st Earl of Northumberland, and Thomas, later 1st Earl of Worcester.

After Mary died in 1362 he married Joan, daughter and sole heiress of John, Lord Orreby. He served as High Sheriff of Northumberland and died around 18 May 1368, probably at Alnwick Castle, and was buried in Alnwick Abbey. His eldest son Henry succeeded him.