John Zápolya, also known as János Szapolyai (Croatian: Ivan Zapolja; Slovak: Ján Zápoľský) (February 2, 1487 – July 22, 1540) is King of Hungary from 1526 to 1540.

His rule is disputed by Archduke Ferdinand I, who also claims the title King of Hungary between 1526 and 1540.

He was the voivode of Transylvania before his coronation.