4th Legion may refer to:
- Legio IV Macedonica founded in 48 BC
- Legio IV Scythica founded c. 42 BC by the general Mark Antony
- Legio IV Flavia Felix founded in AD 70 by the emperor Vespasian from the ashes of the Legio IV Macedonica
- Legio IV Martia
- Legio IV Italica founded in AD 231 by emperor Alexander Severus
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