Procurement usually prioritizes cost aspects; however, it is becoming increasingly important to consider an appropriate balance between financial, environmental and social considerations. This recommendation proposes an approach to both sustainable public-sector procurement as well as sustainable private-sector procurement. It provides key references in this area and offers a sample code of conduct in annex. The purpose of this document is to identify a minimal, common set of policies, standards and good practices that will allow buying corporations to comply with sustainability principles without burdening their MSME suppliers with additional administrative tasks that would go against the good principles of trade facilitation. From a methodological point of view, the concept of sustainability is conceived here according to an integrated perspective—encompassing environmental, social and economic impacts in order to avoid the limiting processes of “Greening the Economy”.