Ursini may refer to:
- Ursini (surname)
- Ursini (Araneidae), a spider tribe in the subfamily Araneinae comprising only the genus Ursa
- Ursini (Ursinae), a tribe in the subfamily Ursinae (the bears)
- a section in the subgenus Rubus of the genus Rubus taxonomy
- a small bipedal alien species in the Mythology of Stargate
- Ursini, a prefix claimed by the Croatian noble family Blagajski, a cadet branch of the Babonić family