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)
- Latin binomial abbreviations for species
- A. ursinus
- B. ursinus
- C. ursinus (disambiguation)
- D. ursinus
- M. ursinus (disambiguation)
- P. ursinus (disambiguation)
- R. ursinus
- V. ursinus