This article examines COVAX, a public private partnership, from a public law perspective. It asks whether COVAX is a legitimate and appropriate instrument with regard to the goal of distributing COVID-19 vaccines in a globally equitable manner and enabling equal access to vaccination worldwide. By developing public-legal legitimacy standards for this purpose, the article critically distances itself from the outset from considering the use of private actors and forms of action in public functions (‘privatization’) essentially as a release of market economy rationality, which enables efficiency and effectiveness gains and relieves the public sector. With the public law perspective, the article questions precisely whether private-law, market-based action is appropriate with respect to the global distribution of vaccines in the pandemic.