Bang Khu Wiang (, ) is one of the nine subdistricts (tambon) of Bang Kruai District, in Nonthaburi Province, Thailand. The subdistrict is bounded by (clockwise from north) Bang Muang, Bang Len, Bang Krang, Bang Khun Kong, Maha Sawat and Plai Bang subdistricts. In 2020, it had a total population of 10,747 people.
The subdistrict is subdivided into 7 administrative villages (muban).
The whole area of the subdistrict is covered by Plai Bang Subdistrict Municipality ().