Add to ORKGOne of the most difficult challenges facing companies today is how to control and implement sustainability not only with direct first-tier suppliers but also how to extend or diffuse sustainability across entire supply networks. A growing body of research is dedicated to this challenge but the role of purchasing in sustainable supply network development remains under-researched. This paper provides a systematic literature review of the role of purchasing in the diffusion of sustainability in supply networks. We identified and analyzed 55 papers published in 11 peer-reviewed journals in the field of purchasing and supply management (PSM). Based on the review, the paper classifies strategies and practices for diffusing sustainability in suppl...