Seka (Thai: เซกา, pronounced [sēːkāː]) is a district (amphoe) in the eastern part of Bueng Kan province, northeastern Thailand.

Neighboring districts are (from the west clockwise) Phon Charoen, Si Wilai, Mueang Bueng Kan, Bung Khla, and Bueng Khong Long of Bueng Kan Province, Na Thom of Nakhon Phanom province, Akat Amnuai, Kham Ta Kla, and Ban Muang of Sakon Nakhon province.

The minor district Seka was established on 16 November 1958, when the five sub-districts, Seka, Dong Bang, Sang, Pho Mak Khaeng, and Tha Kok Daeng were split off from Bueng Kan district.

[2] Seka is divided into nine sub-districts (tambons), which are further subdivided into 136 administrative villages (mubans).

Missing numbers refer to subdistricts split off to form Bueng Khong Long district.