Poland remained a popular destination for migrants from Ukraine for many years before February 24, 2022, the outbreak of full-scale Russian aggression on Ukraine. Ukrainian communities in Polish cities, including local autochthonous Ukrainians (the Ukrainian national minority), are already well-established and well-organized, although they are very diverse. Drawing from anthropological fieldwork conducted in 2021 and at the beginning of 2022, this article seeks to address the nexus of the diaspora and culture and explores the imaginations of “common culture” in diaspora-forming processes. We treat “culture” as diasporic imaginings of naturalized and reified representations of what is to be a Ukrainian in Poland. The essentialized notion of putative “common culture” is routinely discursivized and maintained by diasporic elites. Exploring this as an empirical phenomenon captured in the field helps reveal the internal tensions and that this imagining empowers the production of cultural differences. We argue that imagined “common culture” may actually activate “othering” of the diasporic Other and might not be as unifying a factor in diaspora-forming processes as it appears.