Yue (Cantonese pronunciation: [jyːt̚˨]) is a branch of the Sinitic languages primarily spoken in Southern China, particularly in the provinces of Guangdong and Guangxi (collectively known as Liangguang).

The term Cantonese is often used to refer to the whole branch, but linguists prefer to reserve the name Cantonese for the variety used in Guangzhou (Canton), Wuzhou (Ngchow), Hong Kong and Macau, which is the prestige dialect of the group. Taishanese, from the coastal area of Jiangmen (Kongmoon) located southwest of Guangzhou, was the language of most of the 19th-century emigrants from Guangdong to Southeast Asia and North America. Most later migrants have been speakers of Cantonese.

Yue languages are not mutually intelligible with each other or with other Chinese languages outside the branch. They are among the most conservative varieties with regard to the final consonants and tonal categories of Middle Chinese, but have lost several distinctions in the initial consonants and medial glides that other Chinese varieties have retained.

Cantonese is prototypically used in English to refer to the variety of Yue in Guangzhou, but it is also used to refer to Yue as a whole. To avoid confusion, academic texts may refer to the larger branch as "Yue", following the pinyin system based on Standard Chinese, and either restrict "Cantonese" to the Guangzhou variety, or avoid the term altogether, distinguishing Yue from its Guangzhou dialect. Some linguists such as Anne Yue and Norbert Francis designate Yue Chinese itself as a language.

People from Hong Kong and Macau, as well as Cantonese immigrants abroad, generally refer to their language as 廣東話; Gwóngdūngwá; 'Guangdong speech' [kʷɔ̌ːŋ tʊ́ŋ wǎː]. In Guangdong and Guangxi, people also use the terms 粵語; Yuhtyúh; 'Yue language' [jỳt jy̬ː] and 白話; baahkwá (plain/colloquial speech) [pàːk wǎː]; for example, the expression 南寧白話; Nàahmnìhng baahkwá means 'Nanning colloquial speech'.

The area of China south of the Nanling Mountains, known as the Lingnan (roughly modern Guangxi and Guangdong), was originally home to peoples known to the Chinese as the Hundred Yue (or Baiyue). Large-scale Han Chinese migration to the area began after the Qin conquest of the region in 214 BC. Successive waves of immigration followed at times of upheaval in Northern and Central China, such as the collapse of the Han, Tang and Song dynasties. The most popular route was via the Xiang River, which the Qin had connected to the Li River by the Lingqu Canal, and then into the valley of the Xi Jiang. A secondary route followed the Gan River and then the Bei Jiang into eastern Guangdong. Yue-speakers were later joined by Hakka speakers following the North River route, and Min speakers arriving by sea.

After the fall of Qin, the Lingnan area was part of the independent state of Nanyue for about a century, before being incorporated into the Han empire in 111 BC. After the Tang dynasty collapsed, much of the area became part of the state of Southern Han, one of the longest-lived states of the Five Dynasties and Ten Kingdoms, between 917 and 971.

Large waves of Chinese migration throughout succeeding Chinese dynasties assimilated huge numbers of Yue aborigines, with the result that today's Southern Han Chinese Yue-speaking population is descended from both groups. The colloquial layers of Yue varieties contain elements influenced by the Tai languages formerly spoken widely in the area and still spoken by people such as the Zhuang and Dong.