Abstract: The fall of the Berlin Wall and the disappearance of the communist regimes in Europe represented a radical change for Judaism on the continent. The most striking change occurred, naturally, in Central and Eastern Europe, that is, in those countries that were behind the Iron Curtain, such as Hungary, Poland, Czechoslovakia or the German Democratic Republic. There, while the political decomposition of the Soviet bloc was gaining traction, thousands of people rediscovered their Jewish origins – forbidden, concealed, or silenced under communism, giving rise to a process of Jewish revivalism. In this context, numerous Jewish philanthropic organizations came to the region to support these developments with the mission of renewing local Jewish communities. The process involved a multitude of actors – Jewish agencies, organizations and foundations based in the United States, Europe and Israel – and entailed the mobilization of professionals, specialists and financial resources. This thesis explores the concrete dynamics of this cross-border mobilization of Jewish philanthropic bodies in favor of the Jewish communities of East Central Europe after the fall of communism in 1989. It studies in-depth the historical origins and evolution of transnational Jewish solidarity in modern times, enquires about the Jewish agencies and organizations that started to operate in Europe after the fall of the Berlin Wall, especially, but not only, their sources of financing and the circulation of economic resources. Finally, it gives an account of the narrative corpus that emerged about European Jews before and during this process, identifying those actors who created and mobilized these narratives.