New addition Mae Fah Luang University and Mahidol University topped Thai tertiary institutions in a global survey this year.
Mae Fah Luang and Mahidol were grouped in the 601-800 band in the latest global rankings by the Times Higher Education released on Thursday.
Mae Fah Luang in Chiang Rai province received high scores for research citations and its international outlook, while Mahidol performed best in graduates' income.
International outlook is defined as a university with international students, staff and teachers on the campus.
Chulalongkorn was rated in the lower tier of the 801-1,000 group.
National University of Singapore remained the best in Asean, staying at 25th in the world rankings and its compatriot, Nangyang Technology University second at 48th.
The University of Oxford remained the best for four consecutive years, followed by California Institute for Technology and the Cambridge University.
The Times surveyed 1,300 universities in 92 countries.
