Ursinus may refer to:
- Ursinus College, a liberal arts college in Collegeville, Pennsylvania.
- The first bishop of the diocese of Bourges, Saint Ursinus
- Ursinus the Abbot, author of the Life of Leodegar († after 690)
- Johannes Heinrich Ursinus (1608–1667), Lutheran theologian from Regensburg
- An alias of the Antipope Ursicinus († after 384)
- Zacharias Ursinus, a German theologian († 1583)
- Oskar Ursinus, the German aviation pioneer († 1952)