Wat Chalo (, ) is one of the nine subdistricts (tambon) of Bang Kruai District, in Nonthaburi Province, Thailand. The subdistrict is bounded by (clockwise from north) Bang Si Thong, Bang Kruai, Bang Phlat, Taling Chan, Maha Sawat and Bang Khanun subdistricts. In 2020 it had a total population of 16,691 people.
The subdistrict is subdivided into 10 villages (muban).
The whole area of the subdistrict is covered by Bang Kruai Town Municipality ().