Bang Rak Yai (,) is one of eight subdistricts (tambon) of Bang Bua Thong District, in Nonthaburi Province, Thailand. The subdistricts border (clockwise from the north) Bang Rak Phatthana, Bang Rak Noi, Bang Len and Sao Thong Hin. In 2020, the town has a total population of 9,547.
The sub-region is divided into 11 administrative villages (muban).
The area of the sub-district is shared by two local administrative organizations.