A growing number of left-wing scholars criticize practices of transnational solidarity. Pointing to the cooptation of “globalism” by neoliberal capitalism, these scholars utilize this critique to advance leftwing nationalism. In this article, I reconstruct symptomatic texts of this genre and identify the critique of (liberal) cosmopolitanism as the common denominator in their calls for nationalizing the Left. As a consequence of their opposition to cosmopolitanism, these authors reject freedom of movement or global justice activism. In order to examine whether the (...) project of transnational solidarity is affected by this critique, I reconstruct its justifications in Critical Theory and postcolonial-feminist theory. Hauke Brunkhorst and Chandra Mohanty exemplarily theorize transnational solidarity in different ways, but each based on a substantial critique of liberal cosmopolitanism. By that, I show that a principled return to nationalism derived from a critique of cosmopolitanism is informed by coincidental evidence that rejects practices of transnational solidarity because of their alleged embeddedness in cosmopolitan reason. Drawing on La Via Campesina, I illustrate principles of a transnational solidarity project that is not justified with liberal cosmopolitan ideas. Their experiences challenge the nationalist/statist critique while not falling back into naïve and/or neoliberal cosmopolitanism. (shrink)