Sir John Arundell of Trerice (1495 – 1561), nicknamed "Tilbury Jack" (or Jack of Tilbury), was a commander of the English Royal Navy at the time of King Henry VIII and Edward VI and twice High Sheriff of Cornwall. Arundell served Henry VIII as an Esquire to the Body, and was knighted at the Battle of the Spurs in 1513. In 1523 he achieved notability by the capture of a notorious pirate. Under Edward VI he was Vice-Admiral of the West, and in 1553 was High Sheriff of Cornwall at the time of the accession of Queen Mary.