Na Hom (Thai: นาห่อม) is a tambon (subdistrict) located in the westernmost area of Thung Si Udom district, in Ubon Ratchathani Province, Thailand.

[1] Neighbouring subdistricts are (clockwise from the south) Tha Khlo, Thung Thoeng, Nong Om, and Khok Chamrae.

[2] Following the 1992 separation of five districts from Det Udom: Thung Thoeng, Nong Om, Na Kasem, Khok Chamrae, and Kut Ruea to form a minor district (king amphoe) called "Thung Si Udom,"[3] some communities in tambon Thung Thoeng preferred to remain affiliated with the original district, so the central government decided to split the tambon into two portions, the upper portion of which is now Thung Thoeng and was transferred back to Det Udom in the following year,[4] while the lower region, which consisted of nine villages, was formed a new subdistrict called "Na Hom,"[5] and has been governed by Thung Si Udom since then.

[2] The tambon is located in the western region of the Thung Si Udom district, on the undulating land between the low river plains of the Lam Dom Yai River (ลำโดมใหญ่) in the east and of the Huai Khayung Creek (ห้วยขะยุง) in the west.

[1] The following is a list of the Chief Executives of the Subdistrict Administrative Organization of Na Hom since its establishment in 1997.