Khmer, any member of an ethnolinguistic group that constitutes most of the population of Cambodia. Smaller numbers of Khmer also live in southeastern Thailand and the Mekong River delta of southern Vietnam.
The vast majority of Khmer speakers speak Central Khmer, the dialect of the central plain where the Khmer are most heavily concentrated. Within Cambodia, regional accents exist in remote areas but these are regarded as varieties of Central Khmer.