Leon IV or Leo IV may refer to:
- Leo IV the Khazar (750 – 780), Byzantine Emperor
- Pope Leo IV, pope from 847 – 855
- Leo IV, King of Armenia (1309 – 1341), last Hethumid king of Cilicia
- Leo IV (dwarf galaxy), a dwarf satellite galaxy of the Milky Way
This disambiguation page lists articles about people with the same name.
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