The Berlin Rainwater Agency (Berliner Regenwasseragentur) is a joint initiative of the State of Berlin in Germany and the Berlin Water Utility. The Agency is a public body founded in 2018 to address issues related to rainwater, such as overloading sewage infrastructure and flooding as well as drought and urban heat island effects as a result of water not being retained in the urban landscape. The Rainwater Agency serves as a creative a platform to connect a wide range of public and private actors and engage them in activities that make the city more rain proof and better adapted to climate change. It aims to support the Berlin administration, planners and citizens in the implementation of decentralized rainwater management solutions by raising awareness about the need for and tools for sustainable rainwater management, connecting actors in the city to available knowledge (e.g. technical, legal, financial) and becoming a contact point for private and public actors interested in e.g. implementing nature-based solutions related to rainwater management. The Berlin Rainwater Agency supports the implementation of a number of existing national and federal laws, regulations and strategies. While the Agency was initially to work for two years, its mandate was extended in 2020 and will now run until 2024.