The Marsican brown bear (Ursus arctos arctos, formerly Ursus arctos marsicanus), also known as the "Apennine brown bear", and orso bruno marsicano in Italian, is a critically endangered population or subspecies of the Eurasian brown bear, with a range restricted to the Parco Nazionale d'Abruzzo, Lazio e Molise, and the surrounding region in Italy. The Marsican brown bear differs slightly from other brown bears in its appearance and hibernation techniques. The bear's popular name is derived from Marsica, a historic area of the modern-day region of Abruzzo where the bear has long had a significant presence.