The International Radio and Television Organisation (official name in French: Organisation Internationale de Radiodiffusion et de Télévision or OIRT (before 1960 International Broadcasting Organization (IBO), official name in French: Organisation Internationale de Radiodiffusion (OIR)) was an East European network of radio and television broadcasters with the primary purpose of establishing ties and securing an interchange of information between those various organizations responsible for broadcasting services, promoting the interests of broadcasting, seeking by international cooperation a solution to any matter relating to broadcasting, and studying and working out all measures having as their aim the development of broadcasting.
Without British participation, 26 members founded the OIR on 28 June 1946. The next day, at the General Assembly of the International Broadcasting Union (IBU), an attempt was made to dissolve this body, but the motion failed to obtain the required majority. However, 18 of the 28 existing members left the IBU and become co-founders of the new OIR.
In 1946, the newly created OIR installed itself in the IBU building in Brussels. Technical activity was taken up again under the authority of two directors, one delegated by the Soviet Union and the other by France. However, the political situation gradually degraded into the Cold War and this created an uneasy situation of distrust within the staff of the Technical Centre.
In 1950 some members (mostly western European) left the organization to form the new European Broadcasting Union (EBU), among them Belgium, Egypt, France, Italy, Lebanon, Luxembourg, Monaco, Morocco, Netherlands, Tunisia and Yugoslavia.