In the fall of 1967 in Berlin, members of the Mendelssohn family and researchers into its history founded the Mendelssohn-Gesellschaft at the initiative of Cécile Lowenthal-Hensel, a descendant of Fanny Hensel. As one of its tasks, the association intended to reinstitute the Moses Mendelssohn Scholarship, which had existed from 1929 until 1933. Shortly after its foundation, the society began acquiring autographs and other Mendelssohn documents, which it deposited in the Mendelssohn Archives kept by the Staatsbibliothek Berlin Preussischer Kulturbesitz (State Library of Berlin Prussian Cultural Heritage Foundation). Moreover, the association has been funding the publication of the Mendelssohn-Studien since 1969.
In 1979, the Mendelssohn-Gesellschaft contributed to the establishment of the Moses Mendelssohn Award "for the promotion of tolerance of dissenting beliefs and between nations, races and religions". Since then, the prize has been awarded every two years. The Mendelssohn-Gesellschaft delegates one member to the jury of seven.
In 2009, the Mendelssohn-Gesellschaft merged with Geschichtsforum Jägerstrasse. This association had been founded in 2004 and had developed a permanent exhibition "The Mendelssohn family at Jägerstrasse" in the former coach house (Remise) of the Mendelssohn bank headquarters in Jägerstrasse 51. Moreover, a wide variety of events was organized in the Mendelssohn Remise. By their merger under the name of "Mendelssohn-Gesellschaft", the two associations have now combined their efforts, promoting scientific research into the history of the family and publications while also conceiving and organizing exhibitions to reach a greater audience.