Abstract: The goal of this thesis is to contribute to the overall progress of society towards sustainability by supporting the engagement of employees of multinational organizations. By first identifying unique aspects of sustainability that are important for engagement and aspects of national culture that affect receptivity to sustainability messages, the authors were able to make informed selections of success factors contributing to intercultural sustainability engagement. Within these categories, specific strategies and actions leading to successful engagement were identified, based on interviews and survey results from experienced sustainability practitioners and intercultural management experts, as well as an extensive literature review. The further selection and refinement of these led to the development of a capacity building tool to help sustainability practitioners address cultural differences when working to engage employees of multinational organizations in sustainability.