CLT had on 1 July 1954 changed its name from the earlier Compagnie Luxembourgeoise de Radiodiffusion (CLR), founded in 1931.
In 1997, CLT merged with the Bertelsmann subsidiary UFA Film- und Fernseh GmbH, based in Hamburg, Germany, to create CLT-UFA.
In 2000, CLT-UFA merged with Pearson Television and became part of the RTL Group, with its headquarters at Kirchberg, Luxembourg.
The station was receivable in Belgium until 11 September 1987 when the transmitting frequency used was given up to RTL-TVI and continued for Luxembourg and French viewers until March 1991 when it then became RTL TV which had one variant in Lorraine known as RTL Lorraine, which lasted only until September 1991.
RTLplus, a station which had started in Luxembourg but moved its headquarters to Cologne in January 1988, was present for the launch on 8 December 1989.