Hokkien (/ˈhɒkiɛn/ HOK-ee-en, US also /ˈhoʊkiɛn/ HOH-kee-en) is a variety of the Southern Min group of Chinese languages. Native to and originating from the Minnan region in the southeastern part of Fujian in southeastern China, it is also referred to as Quanzhang (Chinese: 泉漳; Pe̍h-ōe-jī: Choân-chiang), from the first characters of the urban centers of Quanzhou and Zhangzhou.

Taiwanese Hokkien is one of the national languages in Taiwan. Hokkien is also widely spoken within the overseas Chinese diaspora in Singapore, Malaysia, the Philippines, Indonesia, Cambodia, Myanmar, Hong Kong, Thailand, Brunei, Vietnam, and elsewhere across the world. Mutual intelligibility between Hokkien dialects varies, but they are still held together by ethnolinguistic identity.

In maritime Southeast Asia, Hokkien historically served as the lingua franca amongst overseas Chinese communities of all dialects and subgroups, and it remains today as the most spoken variety of Chinese in the region, including in Singapore, Malaysia, Philippines, Indonesia, and Brunei. This applied to a lesser extent to mainland Southeast Asia. As a result of the significant influence and historical presence of its sizable overseas diaspora, certain considerable to ample amounts of Hokkien loanwords are also historically present in the languages it has had historical contact with in its sprachraum, such as Thai. Kelantan Peranakan Hokkien, in northern Malaya of Malaysia, and Hokaglish, spoken sporadically across the Philippines (especially Metro Manila), are also mixed languages, with Hokkien as the base lexifier.

Hokkien speakers in different regions refer to the language as:

In parts of Southeast Asia and in the English-speaking communities, the term Hokkien ([hɔk˥kiɛn˨˩]) is etymologically derived from the Hokkien pronunciation of Fujian (Hok-kiàn), the province from which the language hails. In Southeast Asia and the English press, Hokkien is used in common parlance to refer to the Southern Min dialects of southern Fujian, and does not include reference to dialects of other Sinitic branches also present in Fujian such as the Fuzhou language (Eastern Min), Pu-Xian Min, Northern Min, Gan Chinese or Hakka.

The term Hokkien was first used by Walter Henry Medhurst in his 1832 Dictionary of the Hok-këèn Dialect of the Chinese Language, According to the Reading and Colloquial Idioms, considered to be the earliest English-based Hokkien dictionary and the first major reference work in POJ, though its romanization system differs significantly from modern POJ. In this dictionary, the word Hok-këèn was used. In 1869, POJ was further revised by John Macgowan in his published book A Manual Of The Amoy Colloquial. In this book, këèn was changed to kien as Hok-kien; from then on, "Hokkien" is used more often.

Historically, Hokkien was also known as "Amoy", after the Zhangzhou Hokkien pronunciation of Xiamen (Ēe-mûi), the principal port in southern Fujian during the Qing dynasty, as one of the five ports opened to foreign trade by the Treaty of Nanking. In 1873, Carstairs Douglas published the Chinese–English Dictionary of the Vernacular or Spoken Language of Amoy, With the Principal Variations of the Chang-chew and Chin-chew Dialects, where the language was referred to as the "Language of Amoy" or as the "Amoy Vernacular" and by 1883, John Macgowan would publish another dictionary, the English and Chinese Dictionary of the Amoy Dialect. Due to possible conflation between the language as a whole with its Xiamen dialect, many proscribe referring to the former as "Amoy", a usage that is more commonly found in older media and some conservative institutions.

In the classification used by the Language Atlas of China, the Quanzhang branch of Southern Min consists of the Min varieties originating from Quanzhou, Zhangzhou, Xiamen and the eastern counties of Longyan (Xinluo and Zhangping).