The Mon (Mon: မောန် or မည်; Burmese: မွန်လူမျိုး, pronounced: [mʊ̀ɴ lù mjó]; Khmer: មន, Thai: มอญ, pronounced [mɔ̄ːn]) are an ethnic group from Burma (Myanmar) living mostly in Mon State, Bago Region, the Irrawaddy Delta and along the southern border of Thailand and Burma. One of the earliest peoples to reside in Southeast Asia, the Mon were responsible for the spread of Theravada Buddhism in Indochina. The Mon were a major source of influence on the culture of Burma. They speak the Mon language, an Austroasiatic language, and share a common origin with the Nyah Kur people of Thailand from the Mon mandala (polity) of Dvaravati.
The eastern Mon assimilated to Thai culture long ago. The western Mon of Burma were largely absorbed by Bamar society but continue fighting to preserve their language and culture and to regain a greater degree of political autonomy. The Mon of Burma are divided into three sub-groups based on their ancestral region in Lower Burma: the Man Nya (မန်ည) from Pathein (the Irrawaddy Delta) in the west, the Man Duin (မန်ဒိုၚ်) in Bago in the central region, and the Man Da (မန်ဒ) at Mottama in the southeast.