In this article, I ask to what extent and through what semantic means Polish theatre artists use the concept of liminality as a preferred theatrical strategy for addressing issues related to the cultural diversity of contemporary society. Particularly, I look at the rigidity and impermeability of (mental) borders in Europe, the typically difficult (or impossible) process of arriving in a new place, and the often related experience of marginalization. I analyze “staged liminality” on three levels: the personal one (the state of liminality as the mental condition of individual characters), the semantic one (the state of liminality as a metaphor for the fate of migrants and the associated sense of ambivalence and ambiguity), and the spatial one (the theatrical “representation”/”staging” of urban space as a transitional space). In doing so I highlight three constitutive elements of Polish migrant theatre by artists of the younger generation of immigrants in Germany: First, their works reflect on the issues of identity and belonging related to the concept of liminality; second, they thematize the socio-political stigmatization of migrants and refugees and the resistance it generates; and finally, the artists attempt to overcome such a state of affairs by treating theatrical activity as a kind of intervention. Turner’s concept of liminality, with its three phases, offers a productive framework to reflect on the specificity of the theatre of Polish migrants in the context of postmigrant theatre and the German theatrical landscape more generally.