Sukhothai Thammathirat Open University (STOU) was officially established by Royal Charter on 5 September 1978 as Thailand’s eleventh state university. His Majesty King Bhumibol Adulyadej (King Rama IX) graciously bestowed the university its name in honor of King Prajadhipok (King Rama VII), who once held the title “Prince Sukhothai Thammaracha” prior his accession to the throne.
From 1979 to 1984, STOU had no home campus of its own, so it had to share space with such agencies as the National Education Commission, Thai Airways, the Faculty of Economics of Chulalongkorn University, and the Ministry of University Affairs. In 1981, Mr. Monkol Kanjanapas donated to the university a 30-rai section of land located in Pakkret district of Nonthaburi province. The university then bought more land, bringing the total to approximately 135 rai. Construction at this site began in 1982, and the university began operating from the new location on 9 December 1984.