Sir John Arundell (1495–1561), of Trerice, Cornwall, nicknamed "Tilbury Jack" (or Jack of Tilbury), was a commander of the Royal Navy during the reigns of Kings Henry VIII and Edward VI and served twice as Sheriff of Cornwall.
Sir John Arundell was the eldest son and heir of Sir John Arundell (1470–1512) of Trerice by his wife Jane Grenville (1474–1551), a daughter of Sir Thomas Grenville (died 1513) KB, lord of the manors of Bideford in Devon and of Stowe in the parish of Kilkhampton in Cornwall, Sheriff of Cornwall in 1481 and in 1486 and an Esquire of the Body to King Henry VII.
Arundell was an Esquire of the Body to King Henry VIII, and was knighted at the Battle of the Spurs in 1513. In 1523 he achieved notability by the capture of a notorious pirate. Under King Edward VI he was Vice-Admiral of the West and served twice as Sheriff of Cornwall, in 1542 and in 1553 at the time of the accession of Queen Mary.
Arundell married twice:
Sir John had an illegitimate son Robert Arundell, who founded his own branch of the family at Menadarva, Cornwall, and adopted as his arms the hirondelle arms of Arundell debruised with a bend sinister for bastardy.
Sir John Arundell died in 1561 and was buried at Newlyn East. His monumental brass survives in Stratton Church, Cornwall.