This paper outlines the role of non-market strategy and its relevance to public health. Three broad categories of non-market activity are described: corporate political activity, Corporate Social Responsibility (CSR) and legal activity, with examples relevant to public health. The importance to public health researchers of considering business activity through a non-market lens has been outlined. Using a non-market strategy perspective can assist with understanding the commercial determinants of health and analysing the writing of the 'rules of the game'.