Marcus Marius may refer to:
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Marcus Marius (praetor 102 BC), brother of the seven-time consul Gaius Marius
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Marcus Marius (quaestor 76 BC), quaestor of the Roman Republic in 76 BC
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Marcus Aurelius Marius (died 269), emperor of the Gallic Empire in 269
{{Hndis, Marius, Marcus