Bromberg was the northern of two Prussian government regions, or Regierungsbezirke (Polish: Rejencja), of the Grand Duchy of Posen (1815–1848) and its successor, the Province of Posen (1848–1919). The administrative center was the city of Bromberg (Bydgoszcz), which is now part of Poland.
The region was bordered on the south by the Regierungsbezirk Posen, to the west by the Province of Brandenburg, to the north by West Prussia, and to the east by Congress Poland (part of the Russian Empire).
The Bromberg region had a larger percentage of mostly Protestant Germans than average for the Province of Posen. Other German speakers were by religion Jewish or Roman Catholic. However, around half the population were Roman Catholic Poles. Initially, there was a sizable Jewish minority, but that number diminished over time due to the Ostflucht.