Korat Orchid Society (KOS) Thailand at the commencement was, Korat Orchid Club in Nakhon Ratchasima province (Korat). Lieutenant General Chalerm Inkanok and friends gathered people who loved and liked orchids in order to establish Korat Orchid Club in 1966. The first club president of the Korat Orchid Club was Lt. Gen. Chalerm Inkanok. The second club president was Mr. Surapon Mekwichai. In 1969, Major General Prapon Kunpijit, the third club president had applied to register as an association. It was approved by the Ministry of Education in 1972 as Korat Orchid Society, which Maj. Gen. Prapon Kunpijit was the first association president, (1972-1999). The second association president was Dr. Banphot Buranasin, (2000-2008). The third association president was Dr. Nimit Watanarojrueng, (2009-2019). Mr. Boonyarit Metheekasiwat is the present association president since 2020.

          KOS Thailand is still actively organizing orchids contest at least once a year. KOS Thailand cooperates and supports various activities in addition with orther orchid associations throughout the country all year round. KOS Thailand being honored by Rapee-Kalaya Sagarik Foundation, giving a certificate of merit for goodness and sacrifice for common good on December 4, 2022.