António, Prior of Crato (Portuguese pronunciation: [?~'t?niu]; 1531 – 26 August 1595; sometimes called The Determined, The Fighter or The Independentist), was a grandson of King Manuel I of Portugal and claimant of the Portuguese throne during the 1580 dynastic crisis.
According to some historians, he was King of Portugal as António I of Portugal for 33 days in 1580.
After the crowning of Philip II of Spain as King of Portugal, António claimed the throne until 1583.