Thammasat University Model United Nations was founded in 2011 by a group of young and passionate Thammasat students who have experienced MUN conferences abroad before and wish to open the window of opportunities for those students who MUN was their total stranger. Initially, the beginning of their quest was to develop leadership and competence of young people by recruiting them to attend MUN conferences abroad, such as Harvard National Model United Nations, Harvard World Model United Nations, and Cambridge University International Model United Nations. During these discussions, delegates will leave their comfort zone and challenge themselves to the limit, thus, enhancing their analytical thinking skill, public speaking skill, and their boost up their confidence.

Later, the TUMUN expanded itself by taking the task of raising awareness and interest about MUN among Thai youths. We have organized various activities in all three Thammasat campuses, namely Tha Prachan, Rangsit, and Lampang because we believe in equal distribution of opportunities notwithstanding logistic and other obstacles. We have also hosted off-campus activities to promote MUN society with other universities and Thai general youths. Most importantly we have held an annual TUMUN Conference to provide a platform for students, both local and international, to unlock their potential by attending a conference in Thailand, especially those who may not have sufficient means to attend conferences abroad.