Thung Thoeng (Thai: ทุ่งเทิง) is a tambon (subdistrict) located in the westernmost region of Det Udom District, in Ubon Ratchathani Province, Thailand.

[1] Later in 1961, Thung Thoeng legally gained subdistrict status by absorbing seven and six villages from Som Sa-at and Kaeng, respectively, to form a new administrative division.

In 1992, Thung Thoeng subdistrict, along with Nong Om, Na Kasem, Kut Ruea, and Khok Chamrae, was separated from Det Udom, to form a new district, Thung Si Udom.

[7] But Thung Thoeng was later transferred back to the Det Udon district a year later.

[8] However, before the transfer, nine of its affiliated villages in the southern part were split off to create a new subdistrict, Na Hom, which is currently a tambon of Thung Si Udom district.