巨犀（学名：Indricotherium transouralicum）为一种已经灭绝的犀牛，生活在渐新世晚期与新近纪的中新世早期。巨犀也是目前已知最大的陆行哺乳动物，估计成年巨犀平均高5.2公尺（18呎），身长为8.2公尺（27呎），重约15吨，为草食性，巨犀使用似獠牙状的上颚齿与下颚齿来觅食树叶。

巨犀拥有一个无角的长头部，鼻骨与额骨成拱状。巨犀的化石在亚洲中部与巴基斯坦南部都有出土，尚未在其他地区发现。

P. transouralicum 头颅骨化石。

巨犀全身骨骼，日本国立科学博物馆

Paraceratherium is an extinct genus of hornless rhinoceros, and one of the largest terrestrial mammals that have ever existed. It lived from the early to late Oligocene epoch (34–23 million years ago); its remains have been found across Eurasia between China and the Balkans. Paraceratherium is classified as a member of the hyracodont subfamily Indricotheriinae. Paraceratherium means "near the hornless beast", in reference to Aceratherium, a genus that was once thought similar.