Ferdinand IV
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Ferdinand IV is the name of:
- Ferdinand IV of Castile (1289-1312, king of Castile and León from 1295)
- Ferdinand IV of Germany (1633-1654, king of the Romans from 1653, of Bohemia from 1646, of Hungary from 1647)
- Ferdinand IV of Naples (1751-1825, king 1759-1799; 1799-1806; 1815-1816) (=Ferdinand III of Sicily 1759-1816)
- Ferdinand IV of Tuscany (1835-1908, grand-duke 1859-1860)