The Chinese dragon or loong is a legendary creature in Chinese mythology, Chinese folklore, and Chinese culture generally. Chinese dragons have many animal-like forms, such as turtles and fish, but are most commonly depicted as snake-like with four legs. Academicians have identified four reliable theories on the origin of the Chinese dragon: snakes, Chinese alligators, thunder worship and nature worship. They traditionally symbolize potent and auspicious powers, particularly control over water and weather.

Historically, the Chinese dragon was associated with the emperor of China and used as a symbol to represent imperial power. Liu Bang, the founder of the Han dynasty, claimed that he was conceived after his mother dreamt of a dragon. During the Tang dynasty, emperors wore robes with dragon motif as an imperial symbol, and high officials might also be presented with dragon robes. In the Yuan dynasty, the two-horned, five-clawed dragon was designated for use by the Son of Heaven or emperor only, while the four-clawed dragon was used by the princes and nobles. Similarly, during the Ming and Qing dynasty, the five-clawed dragon was strictly reserved for use by the emperor only. The dragon in the Qing dynasty appeared on the flag of the Qing dynasty.

The dragon is sometimes used in the West as a national emblem of China, though such use is not commonly seen in the People's Republic of China or Taiwan. Instead, it is generally used as the symbol of culture. In Hong Kong, the dragon was a component of the coat of arms under British rule. It was later to become a feature of the design of Brand Hong Kong, a government promotional symbol.

The Chinese dragon has very different connotations from the European dragon – in European cultures, the dragon is a fire-breathing creature with aggressive connotations, whereas the Chinese dragon is a spiritual and cultural symbol that represents prosperity and good luck, as well as a rain deity that fosters harmony. It was reported that the Chinese government decided against using the dragon as its official 2008 Summer Olympics mascot because of the aggressive connotations that dragons have outside of China and chose more "friendly" symbols instead. Sometimes Chinese people use the term "Descendants of the Dragon" (龙的传人; 龍的傳人) as a sign of ethnic identity, as part of a trend started in the 1970s when different Asian nationalities were looking for animal symbols as representations. For example, the wolf may be used by the Mongols as it is considered to be their legendary ancestor.

The dragon was the symbol of the Chinese emperor for many dynasties. During the Qing dynasty, the Azure Dragon was featured on the first Chinese national flag. It was featured again on the Twelve Symbols national emblem, which was used during the Republic of China, from 1913 to 1928.

The dragon has been used as a state symbol in Vietnam. During the Nguyễn dynasty, the dragon was featured on the imperial standards. It was also featured on the coats of arms of the State of Vietnam, and later South Vietnam.

The ancient Chinese self-identified as "the gods of the dragon" because the Chinese dragon is an imagined reptile that represents evolution from the ancestors and qi energy. Dragon-like motifs of a zoomorphic composition in reddish-brown stone have been found at the Chahai site (Liaoning) in the Xinglongwa culture (6200–5400 BC). The presence of dragons within Chinese culture dates back several thousands of years with the discovery of a dragon statue dating back to the fifth millennium BC from the Yangshao culture in Henan in 1987, and jade badges of rank in coiled form have been excavated from the Hongshan culture c. 4700–2900 BC. Some of the earliest Dragon artifacts are the pig dragon carvings from the Hongshan culture.

The coiled dragon or snake form played an important role in early Chinese culture. The character for "dragon" in the earliest Chinese writing has a similar coiled form, as do later jade dragon amulets from the Shang period.