This document provides an overview of the Groundwater Governance project, which aims to improve global groundwater governance. It summarizes that groundwater is a critical global resource, supplying half of drinking water and 40% of irrigation, but is threatened by overuse, pollution, and land use changes. The project brings together organizations to identify guiding principles for sustainable groundwater management. It conducted regional consultations, case studies, and papers on key issues to establish a baseline understanding. This informed a global diagnostic and vision for ensuring long-term groundwater sustainability and security. The resulting Global Framework for Action will provide policy and institutional guidelines and best practices to countries and organizations to catalyze improved groundwater governance.