Public health researchers have used a number of concepts derived from the work of Durkheim, such as anomie and social capital. One concept that has not been deployed in public health discourses is that of the cult of humanity – Durkheim's religion in a society organised around organic solidarity. This paper discusses Durkheim's views on religion and science, and the cult of humanity. The cult of humanity is characterised as having humanity at the centre of worship and combining elements of religion and science. Medicine and complementary therapies are identified as possible candidates to fulfil the role of the cult of humanity, but the institution of public health seems to be a particularly apt candidate. The paper concludes by discussing the way in which this analysis provides insight into the dual advocacy and academic functions of public health, the tension between individual choice and constraint and the buffering role of public health in relation to other social institutions.