Nabinagar is an upazila (administrative subdivision) located in Brahmanbaria District within the Chattogram Division of Bangladesh. As an upazila, it functions as a second-tier administrative unit within the district's governance structure.
The upazila is situated in the eastern region of Bangladesh, part of the broader Chittagong area. Nabinagar serves as a local administrative center for its constituent villages and communities within Brahmanbaria District.