Thailand Post Co., Ltd. (Thai: บริษัทไปรษณีย์ไทย จำกัด), formerly part of the Communications Authority of Thailand until its privatization in 2003, is the state enterprise in the form of company that provides postal services in Thailand. It was established in 1883; its first post office was located in a large building by the Chaophraya river, at the northern side of Ong-Ang canal.