Khilek () is a tambon (subdistrict) of Nam Khun district, in Ubon Ratchathani Province, Thailand. The subdistrict was established in 1977 through the separation of eleven village communities () from the northern portion of tambon Ta Kao.
As of the 2025 consensus, the subdistrict had a population of 7,582, distributed across 13 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: Ta Kao, Phaibun, Kut Ruea, Kaeng, and Yang.
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 1977, Khilek attained subdistrict status through the separation of the northern portion of Ta Kao Subdistrict. Later in 1982, its eastern protion which consisted of eight administrative villages was split to form Phaibun subdistrict.
In 1996, KhilekâÂÂalong with its three administratively related subdistricts, Ta Kao, Phaibun, 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 Khilek 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 Khilek Subdistrict Administrative Organization ().
The subdistrict of Khilek is subdivided into 13 villages (mubans; ) and 13 administrative communities (Moo or Mu;). As of the 2025 census, it had a population of 8,755 people. The entire tambon is governed by the Khilek Subdistrict Municipality.
The following is a list of the subdistrict's mubans, which roughly correspond to the villages.