In 1968, Mr. Paul Sand from The American School of The Hague organised the first Model United Nations in The Hague. In 1981 the THIMUN Foundation was established and is today directed by a Board of Directors consisting of teachers from international and Dutch schools in the The Hague area. The THIMUN offices in The Hague and in Qatar are permanently staffed.
In 1995 the THIMUN Foundation was accredited as a Non-Governmental Organisation (NGO) associated with the United Nations Department of Public Information. 2001 saw the first annual session of the THIMUN Youth Assembly. In 2003 the THIMUN Foundation was granted Roster Consultative Status with the United Nations Economic and Social Council.