; Thai: มหาวิทยาลัยธรรมศาสตร์, RTGS: Mahawitthayalai Thammasat) is a public research university in Thailand with campuses in the Tha Phra Chan area of Bangkok, Rangsit, Pattaya and Lampang Province.

Ironically, the university campus also functioned as an internment camp for Allied civilians, with Thai guards more or less protecting them from abuses by the occupying Japanese.

The original Thammasat degree was replaced by specialised departments in 1949, when the Faculties of Law, Political Science, Commerce and Accountancy, and Economics were founded.

Thammasat added four more faculties during the 1950s and 1960s: social administration, journalism and mass communication, liberal arts, and sociology and anthropology.

Violence first appeared on 25 September when two EGAT employees who handed out protest literature in Nakhon Pathom were branded "communists", beaten to death, and their bodies hung from a wall.

On 4 October, students staged a play on the Thammasat campus to dramatize the hanging of the protesters in Nakhon Pathom.

Several newspapers printed photographs of the mock hanging with one of the students retouched to resemble Crown Prince Vajiralongkorn, an act of lèse-majesté.

Tha Phra Chan Centre (Thai: ศูนย์ท่าพระจันทร์) is in Phra Nakhon District, Bangkok, surrounded by many of Thailand's most famous cultural and historical landmarks, such as Sanam Luang, the Grand Palace, the Temple of the Emerald Buddha, the Bangkok National Museum, the National Theatre, Wat Mahathat Yuwaratrangsarit, and the Chao Phraya River.

The Dome housed Pridi Banomyong's office as well as being the command centre of the Free Thai Movement during the Second World War.

Eight faculties are based at the Tha Phra Chan campus: law, political science, economics, commerce and accountancy, liberal arts, social administration, journalism and mass communication, and sociology and anthropology.

It is in Khlong Luang District, Pathum Thani Province, 42 km north of Bangkok, connected Tha Phra Chan by shuttle bus.

Thammasat University instituted degree programmes in engineering, technologies, physical sciences, and medicine at its Rangsit Centre in the 1980s and 1990s.

The Pattaya Centre houses the College of Innovative Education, which offers advanced degree courses and training in rural development and management.

Courses offered at Thammasat Lampang Center include social development, interdisciplinary sociology, law, and handcraft design.

It has its roots in the law school of the Ministry of Justice, instituted under the reign of King Chulalongkorn by Gustave Rolin-Jaequemyns.

It was the second oldest business school in Thailand after the Faculty of Commerce and Accountancy, Chulalongkorn University which established earlier on the same year.

Its graduates are regularly accepted to the prestigious departments of economics such as Chicago, UC Berkeley, Cornell, Oxford, Cambridge, LSE, Harvard, MIT, Yale, Princeton, PSE.

The purpose of the establishment of the Faculty of Arts at that time was to teach general subjects to all students of the university before they choose to study their majors.

The last major opened by the Faculty of Liberal Arts was the degree in Hispanic and Latin American Studies, the first of its kind in Southeast Asia.

The graduate level also offers Ph.D. in linguistics, History, and English Language Studies which is a combined Master and Doctoral Degree.

Today, the English Department offers an undergraduate programme (Rangsit Centre) in translation, linguistics, intercultural communication, and literature.

[30] The ASEAN-China International (IAC) Programme offers students to choose their specialization from business, languages, media and political science courses focused on China and the ASEAN region.

Today the faculty offers undergraduate programme in newspaper and print media, radio and television broadcasting, cinematography, advertising, public relations, and communications management.

The institute enjoys strong links with Thailand National Science and Technology Development Agency, Thailand Science Park, national graduate schools (such as JGSEE, TGIST, and TAIST)[36] and many international universities, notably its neighbour Asian Institute of Technology, and a group of Japanese and European universities.

During the clinical years, Thammasat University Hospital is used as the main training site and students may undertake electives in foreign countries.

[44] The School of Global Studies is a new and innovative academic initiative within Thammasat University and a front runner in global health and social innovation within Thailand, Southeast Asia and beyond with a track record of excellent research on determinants of public health, student-centered teaching, and academic service relevant to community needs.

[47] QS World University ranking by subject 2019[50] Founder Pridi Banomyong was a senior statesman, former regent, and former prime minister.

Galyani Vadhana, Princess of Thailand and the elder sister of Ananda Mahidol and Bhumibol Adulyadej, was the former head of the foreign language department at the Faculty of Liberal Arts.

Puey Ungphakorn, former governor of the Bank of Thailand, was the dean of the Faculty of Economics, and rector of Thammasat University.

Ammar Siamwalla, former president of the Thailand Development Research Institute, and Jermsak Pinthong, former senator, are former lecturers at the Faculty of Economics.