Denization is an obsolete or defunct process in England and Ireland and the later Kingdom of Great Britain, the United Kingdom, and the British Empire, dating back to the 13th century, by which an alien (foreigner), through letters patent, became a denizen, thereby obtaining certain rights otherwise only normally enjoyed by the King's (or Queen's) subjects, including the right to hold land. The denizen was neither a subject (with citizenship or nationality) nor an alien, but had a status akin to permanent residency today. While one could become a subject via naturalisation, this required a private act of Parliament (or latterly of a colonial legislature); in contrast, denization was cheaper, quicker, and simpler. Denization fell into obsolescence when the British Nationality and Status of Aliens Act 1914 simplified the naturalisation process.
Denization occurred by a grant of letters patent, an exercise of the royal prerogative. Denizens paid a fee and took an oath of allegiance to the crown. For example, when Venetian mariner Gabriel Corbet was granted letters of denization in 1431 for service upon the seas to Henry V and Henry VI, he was required to pay 40 shillings into the hanaper for the privilege.