Mae Ai (Thai: แม่อาย) is the northernmost district (Amphoe) of Chiang Mai Province, northern Thailand. The minor district Mae Ai was created on August 15th, 1967, when the three tambon Mae Ai, Mae Sao and Mae Na Wang were separated from Fang district. It was official upgraded to a full district on June 28th, 1973. 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. The important rivers are the Kok and Fang river.