Phimon Rat (, ) is one of the eight subdistricts (tambon) of Bang Bua Thong District, in Nonthaburi Province, Thailand. The subdistrict is bounded by (clockwise from north) Bang Bua Thong, Sano Loi, Lahan, Bang Phlap, Om Kret, Bang Rak Phatthana, Bang Khu Rat, Thawi Watthana and Sai Noi subdistricts. In 2020 it had a total population of 52,684 people.
The subdistrict is subdivided into 8 administrative villages (muban).
The area of the subdistrict is shared by two local administrative organizations.