This article introduces a special issue on the legal determinants of health, following the publication of the Lancet–O’Neill Institute of Georgetown University Commission’s report on the subject. We contextualize legal determinants as a significant and vital aspect of the social determinants of health, explain the work of the Lancet–O’Neill Commission and outline where consequent research will usefully be directed. We also introduce the papers that follow in the special issue, which together set out in greater detail the work of the (...) Commission and critically engage with different aspects of the report and the application of its findings and recommendations. (shrink)