The aim of this article is to consider whether, when, and why it is morally right to treat members of socially disadvantaged racial or ethnic groups favorably when allocating scarce medical resources. Since the COVID 2019 pandemic has had different impacts on racial and ethnic groups, some U.S. states have given racial and ethnic minorities preferential access to COVID-19 vaccines, leading to controversy over the moral and legal permissibility of doing so. I examine three arguments for affirmative action—the compensation, equality-of-opportunity, (...) and antidiscrimination arguments—and argue that both the equality-of-opportunity and antidiscrimination arguments have the potential to provide well-founded justification for race-based affirmative action for the allocation of scarce medical resources. I also consider further moral requirements that instances of affirmative action based on both or either of the two arguments should comply with for them to be justified. (shrink)