This article presents a framework for understanding the drivers of disparities in postoperative mortality for Māori compared with non-Māori. The article authors recently published a national audit of 4,000,000 procedures undertaken between 2005 and 2017, showing considerable disparities in postoperative mortality for Māori. In the framework presented in this article, disparity drivers are conceptualised as operating in layers, with each factor leading to the next. Layers include structural factors, care system factors, care process factors, care team factors and patient factors