The Archdiocese of Berlin is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in Germany. The archepiscopal see is in Berlin, with the archdiocese's territory extending over Northeast Germany.

Brandenburg, officially the State of Brandenburg, is a state in northeastern Germany. Brandenburg borders the states of Mecklenburg-Vorpommern, Lower Saxony, Saxony-Anhalt, and Saxony, as well as the country of Poland. With an area of 29,480 square kilometres and a population of 2.5 million residents, it is the fifth-largest German state by area and the tenth-most populous. Potsdam is the state capital and largest city, and other major towns are Cottbus, Brandenburg an der Havel and Frankfurt (Oder).