Katherine Neville or Catherine de Neville (born c. 1400 – died after 1483) was the eldest daughter of Ralph Neville 1st Earl of Westmorland (1364–1425) and Joan Beaufort (c. 1379-1440) daughter of John of Gaunt Duke of Lancaster by his mistress (later 3rd wife) Katherine Swynford.On 12 January 1412 Katherine was married at the age of 12 to John Mowbray 2nd Duke of Norfolk (1392–1432).