Wu Chinese: the family Shanghainese belongs to

Shanghainese is not a language on its own. It is one variety of Wu, a branch of Chinese about the size of German, and knowing how that branch is arranged explains most of what is otherwise puzzling about it.

Updated 20 September 2026 · 5 min read

Tap 🔊 to hear an example. Shanghainese examples play the recordings from Verbavia’s course, made with a Shanghainese voice; Mandarin examples play a Mandarin voice.

What Wu is

Wu is one of the primary branches of Chinese, alongside Mandarin, Yue (which includes Cantonese), Min, Hakka, Xiang and Gan. Ethnologue put its speakers at about 83 million in 2021, which makes it larger than German and roughly the size of Yue. It is spoken across the Yangtze delta: Shanghai, southern Jiangsu and most of Zhejiang, with a little of Anhui and Jiangxi.

The first thing to understand is that “Wu” is a classification rather than a language anybody speaks. Wikipedia’s article puts it well: saying that someone speaks Wu is like saying that someone speaks a Romance language. There is no standard Wu, no Wu equivalent of Putonghua, and most speakers do not use the term at all — they name their city’s speech, usually by adding 闲话 ghae gho ‘speech’ or 话 to the place name, which is exactly how 上海闲话 zaon he ghae gho ‘Shanghainese’ is formed.

What makes a variety Wu

The classification goes back to Li Fang-Kuei in 1937, and the boundaries have barely moved since. Li Rong’s test was a single feature: what happened to the voiced stops of the medieval Qieyun sound system. Chao Yuen Ren — himself a native speaker of Changzhou Wu — called that the one necessary and sufficient requirement for a variety to count as Wu.

That feature is the thing to remember, because it is what makes Wu sound the way it does. Wu varieties typically keep all the voiced initials of medieval Chinese, and keep the checked tone as a glottal stop. Mandarin lost both. Cantonese lost the voicing and kept the final consonants. Only Wu and Old Xiang kept the voicing, which is why 步 bu ‘a step’ is a different consonant from 布 pu ‘cloth’ and 怕 pho ‘afraid’ in Shanghainese and in no variety of Mandarin. The pronunciation page works through the whole inventory.

Jerry Norman describes Wu as a set of central dialects — sitting in a transition zone, with features that typify both northern and southern Chinese. That is a fair summary of what a learner meets: a grammar that feels close to Mandarin’s, and a sound system that does not.

How Wu is divided

The first edition of Li Rong’s Language Atlas of China divided Wu into six groups. Speaker figures below are Li’s 2012 estimates.

Taihu is where nearly everybody is: more than half of all Wu speakers, and the one group whose local varieties are mostly mutually intelligible with each other. Everything a learner is likely to have heard of is in it. The southern groups are another matter — Southern Wu is one of the most internally diverse groupings in all of Chinese, and Wenzhounese is famously unintelligible even to its neighbours.

Inside Taihu, where Shanghainese sits

The Atlas divides Taihu again, and this is the level at which Shanghainese becomes a specific thing:

So Shanghainese is Suhujia Taihu Wu — the same subgroup as Suzhou and Jiaxing — and is often given a branch of its own, both because of the city’s history and because the merged Suhujia group would otherwise be unwieldy. How it compares with its immediate neighbours is a page in itself: Shanghainese vs Suzhou, Ningbo and Hangzhou.

What Wu shares beyond its sounds

• Vocabulary of its own. Words found across Wu and nowhere else — 勿 veh ‘not’ where Mandarin has 不, 晓得 shiau teh ‘to know’ where Mandarin has 知道, 白相 bah sian ‘to play’ where Mandarin has 玩.
• Grammar and syntax of its own. Wu has morphological and syntactic innovations that other branches do not, which is part of why historical linguists find it interesting.
• A literary layer from the Southern Song. When the imperial court moved to Lin’an — today’s Hangzhou — it brought a prestige reading pronunciation with it, and Wu varieties have carried two readings for many characters ever since. It is why 人 nyin ‘person’ is nyin in one word and zen in another.
• A reputation. Wu speech, Suzhou’s above all, is traditionally heard as soft — the idiom is 吴侬软语, ‘the tender speech of Wu’.
• A treaty-port loanword layer, in the north. Shanghai’s trade brought in English and French words through Chinese Pidgin English, some of which spread into the rest of Chinese. There is a whole page on those.

Is Wu a language or a group of dialects?

Both words get used, and the confusion is worth taking seriously rather than settling by assertion. Wu has its own ISO 639-3 code, wuu. Its varieties are not mutually intelligible with Mandarin, which is the usual linguistic test for separate languages. But Wu is also not one thing — its own northern and southern halves fail that same test against each other.

The most defensible statement is the layered one: Shanghainese is a variety of Wu; Wu and Mandarin are different languages by the intelligibility test; and Shanghainese is not a dialect of Mandarin under any reading. That argument, with the Chinese term 方言 and Victor Mair’s proposed topolect, is on the language or dialect page.

Where Wu stands now

Nowhere officially. No Wu variety is an official language, none is the medium of instruction in any school, and national policy makes Putonghua the language of education and broadcasting, with other varieties permitted only in particular approved settings. The largest body of written Wu anywhere is Wu Chinese Wikipedia, which had 48,308 articles in September 2026.

Transmission to children is the real question, and for Shanghainese specifically there is survey evidence — covered on is Shanghainese dying? The short version is that the language is not disappearing but is thinning at the youngest end, and that the same pressure applies across Wu.

Where to go from here

This page is the top of a set. Depending on what you came for:

• How it sounds — the full sound inventory, the five tones and the sandhi, and which romanisation to use.
• How it works — grammar, the pronouns, and how it is written.
• How it compares — with Mandarin, with Cantonese, and with its Wu neighbours.
• How to learn it — how hard it is, every resource worth using, phrases for a trip, and the slang.

Sources

1. Wikipedia: Wu Chinese — classification, subgroups and speaker figures (citing Li Rong, Language Atlas of China, 2012; Norman 1988; Chao 1967; Qian 2003)
2. Ethnologue via Wikipedia: Wu Chinese, about 83 million speakers (2021)
3. Norman, J. (1988). Chinese, pp. 180 and 197–198 — the voicing criterion, and Wu as a central group.
4. ISO 639-3 code table: wuu, Wu Chinese (SIL International)
5. Glottolog: Wu Chinese
6. Qian, N., Tang, Z. and Xu, B. (2007), on Western loanwords in Wu — cited in Wikipedia: Wu Chinese.
7. Wu Chinese Wikipedia: statistics
8. Law of the People’s Republic of China on the National Common Language and Script, revised 2025