The European Sustainable Finance Action Plan marked its 5th anniversary in 2023. Since its publication in 2018, the Action Plan reshaped the European sustainable finance. It has also substantially impacted the European and global sustainable finance debate. As this book goes to publication, the Action Plan¿s four key regulations are now all in force. The sustainable finance market is also in the process of reaching a new level of maturity in tackling greenwashing. The new European regulatory architecture for sustainable finance is getting closer and closer to its conceptual completion. The book offers an in-depth overview of this new emerging field of European law. It starts with a discussion of the purpose and underlying principles of the new European regulatory framework for sustainable finance, proceeds with an analysis of the four key regulations that have emerged out of the Action Plan¿s legislative agenda and closes with a section on tackling greenwashing.