Rundfunk Berlin-Brandenburg, commonly shortened to RBB, is an institution under public law for the German states of Berlin and Brandenburg, based in Berlin and Potsdam. RBB was established on 1 May 2003 through the merger of Sender Freies Berlin (SFB) and Ostdeutscher Rundfunk Brandenburg (ORB), based in Potsdam, and is a member of the Association of PSBs in the Federal Republic of Germany (ARD).

Sender Freies Berlin was the ARD public radio and television service for Berlin from 1 June 1954 until 30 April 2003. On 1 January 1992, SFB became the public broadcaster for the whole of reunited Berlin. However, SFB had long had a significant audience in East Berlin for some time before German reunification. On 1 May 2003 it merged with Ostdeutscher Rundfunk Brandenburg to form Rundfunk Berlin-Brandenburg.