Léon Jongen (2 March 1884 – 18 November 1969) was a Belgian composer and organist.

[2] He left his post at Saint-Jacques church in 1908 in order to tour Europe with a piano quartet.

[2] He eventually settled in Paris, becoming accompanist to the tenor Imbart de la Tour.

The Commission de surveillance gave his several directorial responsibilities in 1938 and officially appointed him as director on 1 August 1939.

Even though he was a great admirer of the French romantic school and even knew some influence by César Franck, his musical style evolved towards more modernistic traits.