Nicholas Upton (1400?–1457), was an English cleric, precentor of Salisbury, and writer on heraldry and the art of war.
He was ordained subdeacon on 8 March 1421; but he entered the service of Thomas de Montacute, 4th Earl of Salisbury, and fought against the French in Normandy.
In 1438 he graduated bachelor of canon law from Broadgates Hall, Oxford, and on 11 April 1443 was collated to the prebend of Wildland in St Paul's Cathedral.
Upton was the author of Libellus de Officio Militari; it was dedicated to Humphrey, Duke of Gloucester, and was therefore written before 1446.
Parts were incorporated in the Book of St. Albans;[3] it was transcribed by Robert Glover[4] and it was extensively used by Francis Thynne.