Ferdinand I or Fernando I may refer to:

People

• Ferdinand I of León, the Great (ca. 1000–1065, king from 1037)
• Ferdinand I of Portugal and the Algarve, the Handsome (1345–1383, king from 1367)
• Ferdinand I of Aragon and Sicily, of Antequera (1379–1416, king from 1412)
• Fernando I, Duke of Braganza (1403–1478)
• Ferdinand I of Naples (ca. 1424–1494, king from 1458)
• Ferdinand I, Holy Roman Emperor (1503–1564, king of Hungary and Bohemia from 1526, emperor from 1556)
• Ferdinando I de' Medici, Grand Duke of Tuscany (1549–1609, grand-duke from 1604)
• Ferdinand, Duke of Mantua and Montferrat (1587–1626)
• Azim ud-Din I of Sulu, briefly converted to Christianity under the name Ferdinand I (r. 1735–1748 and 1764–1774)
• Ferdinand I, Duke of Parma, Piacenza and Guastalla (1751–1802, duke from 1765)
• Ferdinand I of the Two Sicilies (1751–1825, king of Naples and Sicily from 1759, king of the Two Sicilies from 1816)
• Ferdinand I of Austria (1793–1875, emperor 1835–1848)
• Ferdinand I of Bulgaria (1861–1948, prince 1887–1908, tsar 1908–1918)
• Ferdinand I of Romania (1865–1927, king from 1914)

Places

• Ferdinand I or Regele Ferdinand, the former name of two Romanian communes:
  • Mihail Kogălniceanu, Constanța
  • 1 Decembrie, Ilfov County

This disambiguation page lists articles associated with the title Ferdinand I.
If an internal link led you here, you may wish to change the link to point directly to the intended article.