Ferdinand I

Ferdinand I or Fernando I may refer to:
Ferdinand I of León the Great (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)
Ferdinand I of Parma Piacenza and Guastalla (1751–1802 duke from 1765)
Ferdinand IV of Naples (1751–1825 king of Naples from 1759 ruled as Ferdinand I of the Two Sicilies from 1816)
Ferdinand I of Austria (1793–1875 emperor 1835–1848)
Ferdinand of Bulgaria (1861–1948 prince 1887–1908 tsar 1908–1918)
Ferdinand I of Romania (1865–1927 king from 1914)
Ferdinand I or Regele Ferdinand the former name of two Romanian communes Mihail Kogălniceanu Constanţa County and 1 Decembrie Ilfov County.