The Nung (pronounced as noong) are a Central Tai ethnic group living primarily in northeastern Vietnam and southwestern Guangxi.

The Nung sometimes call themselves as Tho, which literally means autochthonous (indigenous or native to the land).

Their ethnonym is often mingled with that of the Tày as Tày-Nùng.

According to the Vietnam census, the population of the Nung numbers about 856,412 by 1999 and 968,800 by 2009.

They are the third largest Tai-speaking group, preceded by the Tày and the Thái (Black Tai, White Tai and Red Tai groups), and sixth overall among national minority groups.

They are closely related to the Tày and the Zhuang.

In China, the Nung, together with the Tày, are classified as Zhuang people.

In 1954, several thousand Nung Phàn Slình come to South Vietnam as refugees and settle in Tuyen Duc province.

Following the Sino-Vietnamese war, there are further waves of migration to the Central Highlands.