Mae Ai (Thai: แม่อาย, pronounced [mɛ̂ː ʔāːj]) is the northernmost district (amphoe) of Chiang Mai province, northern Thailand.

[1] It was upgraded to a full district on 28 June 1973.

[2] Neighboring districts are (from the southwest clockwise) Fang of Chiang Mai Province, Shan State of Myanmar, Mae Fa Luang, Mueang Chiang Rai, and Mae Suai of Chiang Rai province.

Mae Ai is divided into seven sub-districts (tambons), which are further divided into 93 administrative villages (mubans).

There is one sub-district municipality (thesaban tambon) in the district: There are six sub-district administrative organizations (SAO) in the district: This Chiang Mai province location article is a stub.