Effective water management is a crucial ingredient for green growth. It is becoming increasingly clear that astute investment in, and management of, water can help to drive green growth. To do this, governments must catalyse water-related investment and innovation that underspin sustained green growth and give rise to new economic opportunities. Drawing on recent OECD work on policies to support green growth, and on water economics and governance, this Policy Perspectives brochure lays out the opportunities to manage and invest in water as a means for green growth. This paper identifies the key policy options that governments can use to assist this transition towards greener growth.