The UN Day of Vesak Celebration is internationally a cultural and humanistic festival of the United Nations International Organizing Committee. The established process of this celebration commenced in year 2000.

​On 15th December 1999, at the 54th conference of the United Nations General Assembly, after discussing item agenda 174 of the program, the General Assembly was officially recognized and acknowledged the celebration or the Day of Vesak (commemorate three days, the birth of the Buddha, his attainment of enlightenment and his passing away, equivalent time is the Full Moon day in the month of May). This day is called the UN Day of Vesak Celebration and considered as the UN Day of religious cultural festival. The celebration will be held at the United Nations Headquarters (New York city, USA), and its Regional Offices over the world from the year 2000 onwards.

​In 2000, first time the UN Day of Vesak Celebration was solemnly held at the United Nations Headquarters, New York, with representatives of Buddhist traditions from 34 countries.