Cultural organisations, with their wide-reaching influence and power to shape narratives and imaginations, are poised to be trailblazers in championing sustainability causes. Our research project “Culture for the Planet”, conducted at the University of Lausanne, Switzerland, aimed to develop frameworks and tools to accompany the cultural sector towards more ambitious and more systematic actions for sustainability. As part of it, we conducted a global survey to assess progress in the realms of social and environmental sustainability, based on a custom-made model we called “The Sustainability Star”. This report presents the results of this survey of 206 leading museums, theatres, and opera houses of every continent.