The popular uprising of 14 October 1973 (Thai: เหตุการณ์ 14 ตุลา, rtgs: Hetkan Sip-Si Tula, "October 14 Event"; or Thai: วันมหาวิปโยค, rtgs: Wan Maha Wippayok, "Day of Great Sorrow") was a watershed event in Thailand's history. The uprising resulted in the end of the ruling military dictatorship of anti-communist Thanom Kittikachorn and altered the Thai political system. Notably, it highlighted the growing influence of Thai university students in politics.
Student activism in Thailand grew during the 1950s as many students became inspired by leftist ideology to mobilise and organize demonstrations and rallies against the pro-American policies of the ruling government. The rise of university students as a political force was also due to the increase in absolute numbers of university students. From 1961 to 1972, the number of university students increased from 15,000 to 150,000, while the number of universities increased from five to seventeen. Prior to 1968, student activity was confined to demonstrations of loyalty rather than demands for change or criticism of the political system. The death of Sarit Thanarat in November 1963 changed things as the government under Thanom was more tolerant of students and intellectuals. The publication of the Social Science Review in the 1960s was credited as being responsible for restarting intellectual thinking and debate in Thai politics. Discussion groups sprang up at major universities which developed into organized and important independent groups, e.g., the "Sapha Na Dome" and "Sethatham" and the "SOTUS" group. These independent groups in turn produced their own writings and the Social Science Review began to publish articles from them. Some of the writings were critical of the government. These groups also started to hold clandestine political seminars which encouraged students to be analytical and critical.