The end of the Second World War saw the mass forced migration of so-called “national” refugees, including German-speakers from East-Central Europe and Italian-speakers from the Istrian Peninsula. Because such migrants arrived in the countries of their putative nationality, they did not qualify as refugees under the UN convention. Yet lobbying organizations on behalf of these groups challenged the postwar consensus dividing “national” from “international” refugees. This presentation focuses on one such organization, the Association for the Study of the World Refugee Problem (AWR). Established in Rome in 1950, this body comprised several hundred social scientists and legal experts largely from ex-fascist countries. I examine key conferences and publications of the AWR, as well as its lobbying efforts at the UNHCR and Council of Europe, to argue that postwar critiques of the UN Refugee Convention were often fueled by nationalist and revanchist politics. By claiming refugee status for the groups it represented, the AWR sought to legitimize demands for a right of return as well as revisions of postwar European borders. At the same time, the AWR established contacts with representatives of non-European countries facing refugee influxes, including India, Israel, Pakistan, and Vietnam, laying the groundwork for the broad-based challenges to the Refugee Convention of the 1960s.