Countess of Northumberland is a title given to the wife of the Earl of Northumberland. Women who have held the title include:
Eleanor Neville, Countess of Northumberland (c.1397-1472) Mary Percy, Countess of Northumberland (died 1572) Anne Percy, Countess of Northumberland (1536–1596) Dorothy Percy, Countess of Northumberland (c.1564-1619) Elizabeth Percy, Countess of Northumberland (1646–1690)