The present article offers a new framework for understanding the early East-European post-war that introduces and conceptualizes the idea of “Void Communities.” The core of the argument is that the disappearance of various groups of Others—ethnic, religious, and class—was one of the most important consequences of the Second World War for Central and Eastern Europe, and particularly for Poland and Ukraine. The Void left by those who had disappeared could be described on several levels, such as physical absence, social and economical dysfunctionality, transformation of the social structure and stratification, property transfer, decline of moral values and norms, and changes in local culture and traditions. Based on an extensive oral history research (of more than 150 interviews) and in-depth reading of ego-documents, the article prioritizes the first-hand perspective of witnesses and centres on those who remained in the post-war Void Communities after their neighbours had been murdered, deported, resettled, or encouraged to leave semi-voluntarily. While the paper primarily focuses on the historical region of Galicia, now divided between Poland and Ukraine, the source material used to analyze the framework for Void Communities includes documents associated with the entire pre-war Polish Second Republic.