Ostdeutscher Rundfunk Brandenburg (ORB – East German Broadcasting Brandenburg), based in Potsdam, was the public broadcaster for the German federal state of Brandenburg from 12 October 1991 until 30 April 2003. It was a member organization of the consortium of public-law broadcasting organizations in Germany, ARD.
ORB merged with the Berlin public broadcaster Sender Freies Berlin (SFB) on 1 May 2003 to form Rundfunk Berlin-Brandenburg (RBB).
Following German reunification, ARD expanded its membership to include public broadcasters in the territory of the former German Democratic Republic (GDR). Four public-broadcasting organizations replaced those of the former GDR: the already existing Hamburg-based Norddeutscher Rundfunk in the north; the already existing West Berlin-based SFB, now covering all of the city; the new Mitteldeutscher Rundfunk for the states of Thuringia, Saxony, and Saxony-Anhalt; and the new Ostdeutscher Rundfunk Brandenburg.
Created on 12 October 1991, ORB joined ARD on 27 November and formally took over from the former Rundfunk der DDR on 1 January 1992.
ORB had originally planned to call itself Ostdeutscher Rundfunk (ODR - East German Broadcasting) on the pattern of the already existing Norddeutscher Rundfunk (NDR - North German Broadcasting), Süddeutscher Rundfunk (SDR - South German Broadcasting), and Westdeutscher Rundfunk (WDR - West German Broadcasting). However, faced with the criticism that the designation ODR could be taken as implying that the new organization covered the whole of the former "East Germany", a more specific name was chosen in the autumn of 1991.