In this article, we explore what it can mean to think with care and do (no) harm as migration researchers investigating the knowledge practices of other migration researchers. We propose an approach that we call double reflexivity. This means to reflect upon the epistemological, methodological, and political implications of other migration researchers’ knowledge production and to scrutinize one’s own knowledge practices. To put double reflexivity into a research practice, we suggest drawing on (self-)reflexive techniques developed in Feminist Science and Technology Studies. Building on María Puig de la Bellacasa’s (Sociol Rev 60:197–216, 2012) three forms of “thinking with care”, we argue that thinking-with means to engage in meaningful conversations with migration researchers outside of one’s own field. Dissenting-within proposes to see other migration researchers as co-producers of migration knowledge and to find ways to criticize their work without doing harm to the individuals involved. Finally, thinking-from-and-for encourages us to take marginalized epistemologies as a starting point. Finally, building on Critical Migration and Border Regime Research, we discuss how the analysis of knowledge practices of other migration researchers can endanger reputations and careers, put relationships at risk and might mean to “do harm” (Stierl, Environ Plan C Politics Space 40:1083–1102, 2020) to those knowledge practices that reinforce inhumane migration policies.