The Indian rhinoceros (Rhinoceros unicornis), also known as the greater one-horned rhinoceros, great Indian rhinoceros, or Indian rhino for short, is a rhinoceros species native to the Indian subcontinent. It is the second largest extant species of rhinoceros, with adult males weighing 2.2 tonnes and adult females 1.6 tonnes. The skin is thick and is grey-brown in colour with pinkish skin folds. They have a single horn on their snout that grows to a maximum of 57.2 cm (22.5 in). Their upper legs and shoulders are covered in wart-like bumps. They are nearly hairless, aside from the eyelashes, ear fringes and tail brush.

The Indian rhinoceros is a largely solitary animal, and they only associate in the breeding season and when rearing calves. They are grazers, and their diet is mainly grass, but may also include twigs, leaves, branches, shrubs, flowers, fruits, and aquatic plants. Females give birth to a single calf after a gestation of 15.7 months; the birth interval is 34 to 51 months. Captive individuals can live up to 47 years. They are susceptible to diseases such as anthrax, and those caused by parasites such as leeches, ticks, and nematodes.