Citing a 2016 survey, the centre said 11,219 British people, 6,800 Australians and 5,852 French nationals visited Thailand to take lessons in the classical martial art.
Others arriving to study kick boxing came from Germany (4,688), Sweden (4,253), Russia (2,183), Denmark (1,855), Japan (1,841), New Zealand (1,781) and Spain (1,633).
Thirty-eight per cent of all the people signing up for muay thai classes chose Phuket as their study destination, 28 per cent Bangkok and 16 per cent Surat Thani.