Phu Kamyao (Thai: ภูกามยาว, pronounced [pʰūː kāːm.jāːw]; Northern Thai: ภูก๋ามยาว, pronounced [pʰūː kǎːm.ɲāːw]) is a district (amphoe) of Phayao province in northern Thailand.

Neighboring districts are (from the north clockwise): Pa Daet of Chiang Rai province; Dok Khamtai, Mueang Phayao, and Mae Chai of Phayao Province.

The mountains of the Phi Pan Nam Range dominate the landscape of the district.

[2] With publication in the Royal Gazette on 24 August the upgrade became official.

[3] The district is divided into three sub-districts (tambons), which are further subdivided into 40 villages (mubans).