The centrality of Sustainable Development Goal (SDG) 3, Good Health and Well-Being, for the realization of Agenda 2030 highlights the importance and weaknesses of international health law as an instrument to realize the SDG itself. An analysis of SDG 3 – its targets, indicators, and institutional structure – reveals that law, in general, has been sidelined and that certain institutions – and their expertise – have not been fully, or, indeed, sufficiently, involved in its implementation. Efforts should be made to facilitate the contribution of international health law in the realization of SDG 3, which implies addressing the material and institutional weaknesses of this fragmented branch of international law.