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The Zhuang languages (/ˈdʒwæŋ, ˈdʒwɒŋ/; autonym: Vahcuengh [βa˧ɕuːŋ˧], Sawndip: 話僮) are more than a dozen Tai languages spoken by the Zhuang people of Southern China in the province of Guangxi and adjacent parts of Yunnan and Guangdong. The Zhuang languages do not form a monophyletic linguistic unit, as northern and southern Zhuang languages are more closely related to other Tai languages than to each other. Northern Zhuang languages form a dialect continuum with Northern Tai varieties across the provincial border in Guizhou, which are designated as Bouyei, whereas Southern Zhuang languages form another dialect continuum with Central Tai varieties such as Nung, Tay and Caolan in Vietnam. Standard Zhuang is based on the Northern Zhuang dialect of Wuming.
The Tai languages are believed to have been originally spoken in what is now southern China, with speakers of the Southwestern Tai languages, which include Thai (modern-day Thailand), Lao (modern-day Laos) and Shan (modern-day Shan State, Myanmar) having emigrated south in the face of Chinese expansion. Noting that both the Zhuang and Thai peoples have the same exonym for the Vietnamese, kɛɛu, from the Chinese commandery of Jiaozhi in northern Vietnam, Jerold A. Edmondson posited that the split between Zhuang and the Southwestern Tai languages happened no earlier than the founding of Jiaozhi in 112 BC. He also argues that the departure of the Thai from southern China must predate the 5th century AD, when the Tai who remained in China began to take family names.