Duke of Castro

Duke of Castro or Duchess of Castro may refer to:


 * As reigning dukes, rulers of the Duchy of Castro of the House of Farnese (1537–1649):
 * Pier Luigi Farnese, 1st Duke of Castro from 1537 to 1545 (1503–1547)
 * Ottavio Farnese, 2nd Duke of Castro from 1537 to 1545 (1545–1547)
 * Orazio Farnese, 3rd Duke of Castro from 1547 to 1553 (1547–1553)
 * Ottavio Farnese, 4th Duke of Castro from 1553 to 1586 (1524–1586)
 * Alexander Farnese, 5th Duke of Castro from 1586 to 1592 (1545–1592)
 * Ranuccio I Farnese, 6th Duke of Castro from 1592 to 1622 (1569–1622)
 * Odoardo Farnese, 7th Duke of Castro from 1622 to 1646 (1612–1646)
 * Ranuccio II Farnese, 8th Duke of Castro from 1646 to 1649 (1630–1694)
 * As titular dukes, heads of the House of Bourbon-Two Sicilies (1861–present):
 * Francis II, King of the Two Sicilies from 1859 to 1861, and Duke of Castro from 1861 to 1894 (1836–1894)
 * Prince Alfonso of Bourbon-Two Sicilies, Duke of Castro from 1894 to 1934 (1841–1934)
 * Prince Ferdinand Pius of Bourbon-Two Sicilies, Duke of Castro from 1934 to 1960 (1869–1960)
 * Prince Ranieri of Bourbon-Two Sicilies, Duke of Castro from 1960 to 1973 (1883–1973)
 * Prince Ferdinand Maria of Bourbon-Two Sicilies, Duke of Castro from 1973	to 2008 (1926–2008)
 * Prince Carlo of Bourbon-Two Sicilies, Duke of Castro from 2008 to present (born 1963)