Ban Phaeng (Thai: บ้านแพง, pronounced [bâːn pʰɛ̄ːŋ]) is a district (amphoe) in Nakhon Phanom province, northeast Thailand.

Neighboring districts are (from the south clockwise): Tha Uthen, Si Songkhram, and Na Thom of Nakhon Phanom Province, and Bueng Khong Long of Bueng Kan province.

Originally the area belonged to the Mueang Chaiburi, now part of the Tha Uthen district.

[2] In 1956 the sanitary district (sukhaphiban) Ban Phaeng was established,[3] which was upgraded to a sub-district municipality (thesaban tambon) in 1999.

The district is divided into six sub-districts (tambons), which are further subdivided into 75 villages (mubans).