Green bond is a financial instrument that taps the capital markets to support investments addressing environmental challenges, including climate change. The growth of the green bond market has sparked interest from decision-makers in treasury departments in many countries. Issuance in 2017 reached USD 165 billion and by June 2018 there were about USD 335 billion in outstanding green bonds. The World Bank is a key promoter of green bonds as a means to raise awareness about today’s pressing environmental challenges and the value of increased transparency on the use of proceeds for social and environmentally oriented investments. The Bank has issued over 140 green bonds in 19 currencies totaling USD 11 billion (as of July 2018). Building on its experience as a pioneer in the green bond market, the World Bank is honored to provide advisory services to governments and sub-sovereign entities as they build expertise in issuing green bonds with the potential to attract new investors to climate and environmental investments. A common question from issuers is how to meet the additional proceeds management and reporting requirements that make green bonds unique. We hope this Guide will become the “go to” source that helps demystify these requirements. This practical Guide takes the approach of working with the existing capacity and systems of issuers and gradually aiming at higher levels of reporting. It offers examples, answers to frequently asked questions, and a sample reporting them.