<p>This study examines how premigratory political socialization under communism relates to the political integration of Vietnamese migrants in Poland, understood as migrants’ incorporation into the host society through both latent and manifest forms of political participation. While research on migrant integration has largely emphasized post-migration experiences and socioeconomic resources, less attention has been paid to how political orientations formed before migration influence engagement with democratic institutions. Drawing on mixed-methods data from 347 survey respondents and 15 interviews, the study distinguishes between two dimensions of communist socialization: exposure to the socialist political system and participation in communist organizations prior to migration. The findings indicates that early exposure to communist rule during formative years is associated with lower levels of political interest and participation, whereas previous involvement in communist organizations is linked to higher levels of manifest political participation. At the same time, post-migration re-socialization, particularly associational involvement and longer residence, shows positive relationships with multiple forms of political engagement. By connecting premigratory political socialization to migrants’ political participation after settlement, the study contributes to scholarship on political integration and highlights how political dispositions formed under authoritarian rule continue to influence, but not fully determine, migrants’ engagement with democratic institutions.</p>