Pai (ปาย) is a small town (pop. 3,000) in Mae Hong Son Province, Northern Thailand. It is a major stop on the Mae Hong Son Loop, which takes Rte 1095 from Chiang Mai to Mae Hong Son, then Rte 108 back to Chiang Mai. The city is named after the Pai River.
Set in a large picturesque valley north of Chiang Mai, Pai is tourism-oriented, offering a relaxed atmosphere with a vibrant tourist and backpacker scene. The town's permanent residents are a seemingly harmonious mix of common Thai folk, with an admixture of Western hippies and Thai rastas thrown in, which gives the place a unique vibe which may be appealing to some and off-putting to others. Pai is now sometimes referred to as the "Khao San Road of the North".