Na Krasaeng (Thai: นากระแซง) is a tambon (subdistrict) of Det Udom District, in Ubon Ratchathani Province, Thailand.

[1] Neighbouring subdistricts are (clockwise from the south) Nong Om, Thung Thoeng, Khok Sawang, Na Charoen, and Som Sa-at.

[3] Later in 1945, the community size increased to 60–70 households, and the district government of Det Udom then renamed it "Na Krasaeng," after the runnel name formed in the area, as well as officially registering it as a new village under the control of Som Sa-at subdistrict.

[3][4] The tambon is located in the southwestern region of the Det Udom district, on a plateau with a tropical savanna climate.

[1][2] The following is a list of the subdistrict's mubans, which roughly correspond to the villages, as of the 2021 census.