The Giant Panda (Ailuropoda melanoleuca), sometimes called a panda bear or simply panda, is a bear species endemic to China. It is characterised by its bold black-and-white coat and rotund body. The name "giant panda" is sometimes used to distinguish it from the red panda, a neighboring musteloid. Though it belongs to the order Carnivora, the giant panda is a folivore, with bamboo shoots and leaves making up more than 99% of its diet. Giant pandas in the wild occasionally eat other grasses, wild tubers, or even meat in the form of birds, rodents, or carrion. In captivity, they may receive honey, eggs, fish, yams, shrub leaves, oranges, or bananas along with specially prepared food.

The giant panda lives in a few mountain ranges in central China, mainly in Sichuan, and also in neighbouring Shaanxi and Gansu. As a result of farming, deforestation, and other development, the giant panda has been driven out of the lowland areas where it once lived, and it is a conservation-reliant vulnerable species. A 2007 report showed 239 pandas living in captivity inside China and another 27 outside the country. By December 2014, 49 giant pandas lived in captivity outside China, living in 18 zoos in 13 countries. Wild population estimates vary; one estimate shows that there are about 1,590 individuals living in the wild, while a 2006 study via DNA analysis estimated that this figure could be as high as 2,000 to 3,000. Some reports also show that the number of giant pandas in the wild is on the rise. By March 2015, the wild giant panda population had increased to 1,864 individuals.[15] In 2016, it was reclassified on the IUCN Red List from "endangered" to "vulnerable", affirming decade-long efforts to save the panda. In July 2021, Chinese authorities also reclassified the giant panda as vulnerable.

The giant panda has often served as China's national symbol, appeared on Chinese Gold Panda coins since 1982 and as one of the five Fuwa mascots of the 2008 Summer Olympics held in Beijing.

For many decades, the precise taxonomic classification of the giant panda was under debate because it shares characteristics with both bears and raccoons. However in 1985, molecular studies indicate the giant panda is a true bear, part of the family Ursidae. These studies show it diverged about 19 million years ago from the common ancestor of the Ursidae;[20] it is the most basal member of this family and equidistant from all other extant bear species. The giant panda has been referred to as a living fossil.

Two subspecies of giant panda have been recognized on the basis of distinct cranial measurements, colour patterns, and population genetics.

• The nominate subspecies, A. m. melanoleuca, consists of most extant populations of the giant panda. These animals are principally found in Sichuan and display the typical stark black and white contrasting colours.

• The Qinling panda, A. m. qinlingensis, is restricted to the Qinling Mountains in Shaanxi at elevations of 1,300–3,000 m (4,300–9,800 ft). The typical black and white pattern of Sichuan giant pandas is replaced with a light brown and white pattern. The skull of A. m. qinlingensis is smaller than its relatives, and it has larger molars.

A detailed study of the giant panda's genetic history from 2012 confirms that the separation of the Qinlin population occurred about 300,000 years ago, and reveals that the non-Qinlin population further diverged into two groups, named the Minshan and the Qionglai-Daxiangling-Xiaoxiangling-Liangshan group respectively, about 2,800 years ago.

Despite its taxonomic classification as a carnivoran, the giant panda's diet is primarily herbivorous, consisting almost exclusively of bamboo. However, the giant panda still has the digestive system of a carnivore, as well as carnivore-specific genes,[56] and thus derives little energy and little protein from consumption of bamboo. The ability to break down cellulose and lignin is very weak, and their main source of nutrients comes from starch and hemicelluloses. The most important part of their bamboo diet is the shoots, that are rich in starch which they have a higher capability to digest than strict carnivores, and have up to 32% protein content. During the shoot season, which lasts from April to August, they put on a lot of weight, which allows them to get through the nutrient-scarce period from late August to April, when they feed mostly on bamboo leaves. Pandas are born with sterile intestines and require bacteria obtained from their mother's feces to digest vegetation. The giant panda is a highly specialised animal with unique adaptations, and has lived in bamboo forests for millions of years.

The average giant panda eats as much as 9 to 14 kg (20 to 31 lb) of bamboo shoots a day to compensate for the limited energy content of its diet. Ingestion of such a large quantity of material is possible and necessary because of the rapid passage of large amounts of indigestible plant material through the short, straight digestive tract. It is also noted, however, that such rapid passage of digesta limits the potential of microbial digestion in the gastrointestinal tract, limiting alternative forms of digestion. Given this voluminous diet, the giant panda defecates up to 40 times a day.[64] The limited energy input imposed on it by its diet has affected the panda's behavior. The giant panda tends to limit its social interactions and avoids steeply sloping terrain to limit its energy expenditures.