Mandarin as the official language of the People's Republic of China, the Republic of China (Taiwan), and one of Singapore official language.

Mandarin, is a category of related Chinese dialects spoken across most of northern and south-western China. When taken as a separate language, as is often done in academic literature, the Mandarin language has more native speakers than any other language. The "standard" in Standard Mandarin refers to the standard Beijing dialect of the Mandarin language.

Mandarin is also a general term describing any grade of nobility in the Chinese Imperial Court.

In English, Mandarin can refer to either of two distinct concepts:

§ In everyday use Mandarin refers to Standard Chinese or Standard Mandarin (Putonghua / Guoyu / Huayu), which is based on the particular Mandarin dialect spoken in Beijing. Standard Mandarin functions as the official spoken language of the People's Republic of China, the official language of the Republic of China (Taiwan), and one of the four official languages of Singapore. "Chinese"—in practice Standard Mandarin—is one of the six official languages of the United Nations.

§ In its broader sense, Mandarin is a diverse group of Mandarin dialects spoken in northern and southwestern China. This group of dialects is the focus of this article.

The latter grouping is defined and used mainly by linguists, and is not commonly used outside of academic circles as a self-description. Instead, when asked to describe the spoken form they are using, Chinese speaking a form of non-Standard Mandarin will describe the variant that they are speaking, for example Southwestern Mandarin or Northeastern Mandarin, and consider it distinct from "Standard Mandarin"; they may not recognize that it is in fact classified by linguists as a form of "Mandarin" in a broader sense. Nor is there a common "Mandarin" identity based on language; rather, there are strong regional identities centred on individual dialects, because of the wide geographical distribution and cultural diversity of its speakers.

Like all other varieties of Chinese, there is significant dispute as to whether Mandarin is a languageor a dialect. See Identification of the varieties of Chinese for more on this issue.

The present divisions of the Chinese language developed out of the different ways in which dialects of Old Chinese and Middle Chinese evolved.

Most Chinese living in northern and south-western China are native speakers of a dialect of Mandarin. The prevalence of this linguistic homogeneity in northern China is largely the result of geography: much of northern China is covered by plains and is flat. In contrast to this, the mountains and rivers of southern China have promoted linguistic diversity.

Chronologically, there is no clear line to mark where Middle Chinese ends and Mandarin begins; however, the Zhōngyuán Yīnyùn, arhyme book from the Yuan Dynasty, is widely regarded as a milestone in the history of Mandarin. In this rhyme book we see many characteristic features of Mandarin, such as the reduction and disappearance of final stop consonants and the reorganization of the Middle Chinese tones.

Until the mid-20th century, most Chinese people living in southern China spoke only their local language. Beijing Mandarin became dominant during the Manchu-ruling Qing Dynasty, and from the 17th century onward, the empire established orthoepy academies in an attempt to make local pronunciations conform to the Beijing standard so that the Emperor could communicate with all officials directly. These attempts, however, had little success.

This situation changed with the widespread introduction of Standard Mandarin as the national language, to be used in education, the media, and formal situations in both the PRC and the ROC (but not in Hong Kong). As a result, Standard Mandarin can now be spoken intelligibly as a second language by most younger people in Mainland China and Taiwan, with various regional accents. In Hong Kong and Macau, because of their colonial and linguistic history, the language of education, the media, formal speech and everyday life remains the local Cantonese, although Standard Mandarin is very influential now.