Cultural sustainability has become a growing priority within sustainable development agendas, and is now often depicted as a fourth pillar, equal to social, economic, and environmental concerns. Museums and libraries play a unique role within cultural sustainability by preserving their communities’ heritage. However, sustainability policy and research within these sectors still tends to focus on the social, economic, and environmental pillars. This article provides a critique of sustainability policy and research for museums and libraries. It argues that more explicit coverage of cultural sustainability is required to not only improve the contributions of museums and libraries to cultural sustainability, but also to provide an increased und...