Marius may refer to:
- Hierophant Marius, the Black Knights' Fortress' resident priest
- Marius, an ill refugee in Burgh de Rott who was assassinated by Vyrewatch
- Marius, a former squire alongside Sir Theodore
- Marius, a mischievous snow imp
- Marius Giste, an archaeologist in employment of the Varrock Museum
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