Phaibun () is a tambon (subdistrict) of Nam Khun district, in Ubon Ratchathani Province, Thailand. The subdistrict was established in 1982 through the separation of eight village communities () from the western portion of tambon Khilek.
As of the 2025 consensus, the subdistrict had a population of 7,582, distributed across 15 villages (Muban; à ¸Âà ¹Âà ¸²à ¸ or à ¸«à ¸¡à ¸¹à ¹Âà ¸Âà ¹Âà ¸²à ¸Â). It is bordered by the following neighboring subdistricts, listed clockwise from the south: Khok Sa-at, Non Samran, Khanun, Kut Salao, Kut Ruea, Khilek, and Ta Kao.
Prior to 1912, the areaâÂÂthen administratively part of Ta Kao SubdistrictâÂÂwas governed under , a former provincial unit of Thailand. In 1912, following administrative reorganization, the area was transferred to Det Udom District, and Det Udom itself was transferred from to Ubon Ratchathani province.
Subsequently, in 1974, the territory of Ta Kao Subdistrict was separated from Det Udom District and incorporated into the newly established Nam Yuen District, together with three other subdistricts formerly under Det Udom.
In 1982, Phaibun attained subdistrict status through the separation of the western portion of Khilek Subdistrict. Khilek itself had previously been carved out of Ta Kao Subdistrict in 1977. Later, in 1996, PhaibunâÂÂalong with its three administratively related subdistricts, Ta Kao, Khilek, and Khok Sa-atâÂÂwas separated from Nam Yuen District to form Nam Khun District.
During the initial phase of its establishment, the subdistrict was governed by the Phaibun Subdistrict Council (), functioning as the local administrative authority in accordance with the prevailing framework of Thai local administration. In 1997, the council was formally reorganized and upgraded to the status of the Phaibun Subdistrict Administrative Organization ().
The subdistrict of Phaibun is subdivided into 15 villages (mubans; ) and 15 administrative communities (Moo or Mu;). As of the 2025 census, it had a population of 7,582 people. The entire tambon is governed by the Phaibun Subdistrict Administrative Organization.
The following is a list of the subdistrict's mubans, which roughly correspond to the villages.