Admiral of the Fleet Sir Ralph de Spigurnell or Ralph Spigurnell (c. 1317-1373), was a Medieval knight, diplomatic envoy and English naval commander who was appointed Admiral of all the Fleets of the English Navy, Warden of the Cinque Ports and Constable of Dover Castle who served under King Edward III of England from 1337 to 1373.

The first known account of Ralph Spigurnell appears in April 1337 when he was part of a group of advisers to the Bishop of Lincoln, under orders from King Edward III who was sent along with the Earl of Huntington and Earl of Salisbury to officiate the marriage between the eldest son of the Count of Flanders, Louis II and the Princess Joan.

Sir Ralph Spigurnell died on 13 January 1373 and was interned at Greyfriars, London he left his estate to his widow .

[9] There are no records to ascertain who his parents were but records do exist of possible relatives such as Sir Henry Spigurnell, a justice of the King's Bench may have been his father and a Sir John Spigurnell of Buckinghamshire, who were noted in official documents as living during the reign of King Edward II.

[10] At the time of his death he was married to Elizabeth de Spigurnell who was residing in the Manor of Selgrave she sold the estate in 1397 to the Prior and Convent of Christchurch in Canterbury.