International migration is increasing not only in absolute terms but also as a percentage of the global population. In 2019, international migrants made up 3.5 per cent of the global population, compared to 2.8 per cent in the year 2000. Over the past two decades, a philosophical literature has emerged to investigate what justice requires with respect to these vast migrant flows. My article criticizes much of this philosophical work. Building on the work of Charles Mills (2015), I argue that (...) the terms in which many Anglo-American philosophers presently debate migration justice neglect and even obscure consideration of the ways in which current migration flows may be shaped by Euro-American colonialism and neo-colonialism. Such exclusions produce systematic biases in much of our philosophical literature. To develop less biased understandings of migration justice, I propose that Anglo-American philosophers should revise our methods and our conceptual frameworks to enable exploring the possible extent and ethical implications of colonial and neo-colonial influence. This is one part of the much larger task of decolonizing our political philosophy. (shrink)