Blomberg is a municipality in the district of Wittmund, in Lower Saxony, Germany. It lies in the northwestern part of the country, within a district whose administrative seat is the town of Wittmund.
As a municipality, Blomberg forms part of the local administrative structure of the Wittmund district, one of the districts that make up the state of Lower Saxony. The surrounding region is characteristically rural and low-lying, typical of northwestern Germany.