Plai Bang (, ) is one of the nine subdistricts (tambon) of Bang Kruai District, in Nonthaburi Province, Thailand. Neighbouring subdistricts are (from north clockwise) Bang Muang, Bang Khu Wiang, Maha Sawat, Chimphli, Sala Thammasop and Sala Klang. In 2020 it had a total population of 19,358 people.
The subdistrict is subdivided into 5 administrative villages (muban).
The whole area of the subdistrict is covered by Plai Bang Subdistrict Municipality ().