Áo dài (English: ; Vietnamese: [ʔaːw˧˦ zaːj˨˩] (North), [ʔaːw˦˥ jaːj˨˩] (South)) is a modernized Vietnamese national garment consisting of a long split tunic worn over silk trousers. It can serve as formalwear for both men and women. Áo translates as shirt and dài means "long".The predecessor of áo dài was derived by the Nguyễn lords in Phú Xuân during 18th century. This outfit was derived from the áo ngũ thân, a five-piece dress commonly worn in the 19th and early 20th centuries. The áo dài was later made to be form-fitting which was influenced by the French, Nguyễn Cát Tường and other Hanoi artists redesigned the áo dài as a modern dress in the 1920s and 1930s. The updated look was promoted by the artists and magazines of Tự Lực văn đoàn as a national costume for the modern era. In the 1950s, Saigon designers tightened the fit to produce the version worn by Vietnamese women. Áo dài for women was commonly worn in South Vietnam in the 1960s and early 1970s. On Tết and other occasions, Vietnamese men may wear an áo gấm, a version of the áo dài made of very thick fabric and with sewed symbols.
Áo dài has traditionally been marketed with a feminine appeal, with "Miss Ao Dai" pageants being popular in Vietnam and with overseas Vietnamese. However, the men version of áo dài or modified áo dài are also worn during weddings or formal occasions. Áo dài is often paired with nón lá or khăn vấn.

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