Henry Percy, 3rd Earl of Northumberland, English politician (b. 1421)
Henry Percy, 3rd Earl of Northumberland, (25 July 1421 – 29 March 1461) was an English magnate.

The Earldom of Northumberland was then one of the greatest landholdings in northern England; Percy also became Lord Poynings on his marriage. This title would bring him into direct conflict with the Poynings family themselves, and indeed, feuds with neighbouring nobles, both lay and ecclesiastical, would be a key occupancy of his youth.

Percy married Eleanor Poynings, who outlived him; together they had four children. He was a leading Lancastrian during the Wars of the Roses, from which he managed to personally benefit, although his father died early in the war. He was not, however, to live to enjoy these gains, being killed at the Battle of Towton in 1461 on the defeated Lancastrian side.