Henry Percy, 2nd Earl of Northumberland (February 3,1393 – May 22, 1455) is an English nobleman and military commander in the lead up to the Wars of the Roses.

He is the son of Henry "Hotspur" Percy, and the grandson of Henry Percy, 1st Earl of Northumberland.

His father and grandfather are killed in different rebellions against Henry IV in 1403 and 1408 respectively, and the young Henry spends his minority in exile in Scotland.

Only after the death of Henry IV in 1413 is he reconciled with the Crown, and in 1416 he is created Earl of Northumberland.

In the following years, Northumberland occasionally serves with the king in France, but his main occupation is the protection of the border to Scotland.

At the same time, a feud with the Neville family is developing, particularly with Richard Neville, Earl of Salisbury.

This feud becomes entangled with the conflict between the Duke of York and the Duke of Somerset over control of national government.

The conflict culminates in the first battle of the Wars of the Roses, at St Albans, where both Somerset and Northumberland are killed.