Bang Khun Kong (, ) is one of the nine subdistricts (tambon) of Bang Kruai District, in Nonthaburi Province, Thailand. The subdistrict is bounded by (clockwise from north) Bang Krang, Bang Khanun, Maha Sawat and Bang Khu Wiang subdistricts. In 2020, it had a total population of 11,171 people.
The subdistrict is subdivided into 6 administrative villages (muban).
The whole area of the subdistrict is covered by Bang Khun Kong Subdistrict Administrative Organization ().