Orosius (Paulus Orosius, b. c. 375, d. 418?) was a Christian historian, theologian and student of Augustine of Hippo from Gallaecia.

Orosius may also refer to:

• Orosius (leafhopper), a bug genus in the family Cicadellidae
• Bobbio Orosius, an early 7th-century manuscript of the Chronicon by Paulus Orosius

• List of Roman cognomina

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