Seventeen Thai universities have been listed in the World University Rankings 2021, with Chulalongkorn, Mae Fah Luang and Mahidol universities in the top 800.
King Mongkut's University of Technology Thonburi is ranked in the top 801-1,000 and the other 13 universities are in the next bracket, for those ranked 1,000+.
The Times Higher Education World University Rankings 2021 include more than 1,500 universities across 93 countries and regions, making it the largest and most diverse university survey to date, the report said.
The table is based on 13 performance indicators across four areas: teaching, research, knowledge transfer and international outlook.
This year's ranking analysed more than 80 million citations from 13 million research publications and included survey responses from 22,000 scholars globally.
The University of Oxford tops the rankings for the fifth consecutive year, while mainland China's Tsinghua University has become the first Asian university to break into the top 20 under the current methodology, launched in 2011.
Oxford's main rival, the University of Cambridge, dropped to 6th place.
The National University of Singapore, in 25th place, is the highest-placed institution from Southeast Asia.
The US claims a record eight places in the top 10, after the University of California, Berkeley climbed six places to seventh, but US universities outside the top 200 showed signs of decline, the ranking body said.
The top 10 are the University of Oxford; Stanford University; Harvard University; California Institute of Technology; Massachusetts Institute of Technology; the University of Cambridge; University of California, Berkeley; Yale University; Princeton University and the University of Chicago.
Meanwhile, there are 141 first-time entrants in the rankings this year, topped by France's recently merged Paris-Saclay University (joint 178th).
India has the highest number of new entries (14) and as a result boasts a record number of ranked institutions (63), the rankings said.