Ngao (Thai: งาว, pronounced [ŋāːw]) is a district (amphoe) of Lampang province, northern Thailand.

Neighboring districts are (from the south clockwise): Mae Mo, Chae Hom and Wang Nuea of Lampang Province, Mueang Phayao and Dok Khamtai of Phayao province, and Song of Phrae province.

The Phi Pan Nam Mountains dominate the landscape of the district.

A section of Tham Pha Thai National Park is in Ngao District.

Originally named Mueang Ngao, the district was renamed Ngao in 1938, as the prefix Mueang was then reserved for the capital districts of the provinces.