The new EU Procurement Directives reinforced the importance of sustainable development by facilitating the strategic use of public procurement to achieve broader societal goals and as such offer significant new opportunities for sustainable public procurement. The task of today is to better understand the continuously developing concepts of SPP, as well as to identify the drivers and barriers that promote or hinder its further implementation. This article firstly deals with the relationship between the concepts of sustainability, Corporate Social Responsibility (CSR) and public procurement. Secondly, as Denmark has been known as a pioneer in sustainable development, including implementation of it in public purchasing this article focuses on recent developments in the areas of CSR and sustainable public procurement in Denmark, and analyses relevant Danish Public Procurement Complaints Board decisions.