Ferdinand IV
- 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)
Categories: Disambiguation