Chiang Mai (Thai: เชียงใหม่, pronounced [t͡ɕʰīaŋ.màj]; Lanna: ᨩ᩠ᨿᨦᩉᩲ᩠ᨾ᩵, pronounced [tɕiaŋ.màj]) is the second-largest province (changwat) of Thailand. It is in the country's north. It is bordered by Chiang Rai to the northeast, Lampang and Lamphun to the south, Tak to the southwest, Mae Hong Son to the west, and Shan State of Burma to the north. The capital, Chiang Mai, is 685 km north of Bangkok.

Chiang Mai Province is about 685 km (426 mi) from Bangkok in the Mae Ping River basin and is on average at 300 m (1,000 ft) elevation. Surrounded by the mountain ranges of the Thai highlands, it covers an area of approximately 20,107 km² (8,000 sq mi). The mountains of the Daen Lao Range (ทิวเขาแดนลาว) at the north end of the province, the Thanon Thong Chai Range (เทือกเขาถนนธงชัย) stretching in a north-south direction, and the Khun Tan Range in the east of the province are covered by rain forest. The Mae Ping, one of the major tributaries of the Chao Phraya River, originates in the Daen Lao mountains. The highest mountain in Thailand, Doi Inthanon at 2,565 metres (8,415 ft), is in Chiang Mai Province. Several other national parks are also in the province: Doi Suthep-Pui,Ob Luang,Sri Lanna,Huai Nam Dang,Mae Wang, and Pha Daeng.

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