Abstract   Background: With the heightening pressure of climate change, the public as well as the corporate world calls for leaders that can drive sustainable development, hence tackling the challenges to come. Companies are facing growing pressure from both internal and external stakeholders to adopt sustainable practices. As a consequence, the question arises as to whom is the most suitable for such challenges. The presence of female leaders in corporate settings have shown to increase sustainable performance within companies. However, what actual role female leaders play in enabling such performance remains subdued. Purpose: The purpose of this thesis is to study what role female leaders play in sustainability strategy processes.  Method: This study is conducted through qualitative case study methods, using primary data collected from interviews with female leaders of Swedish companies.   Conclusion: The results identified that female leaders play different roles in the sustainability strategy process. The roles identified in the study are Carer, Responsibility Taker, Equality, Enabler and Motivator which are collectively conceptualized as Holistic Trustee meaning; Someone who includes all perspectives and components into their assessment, so that decisions made, enables development while preserving resources of coming generations. In such role, the female leader bridges the organizational level and individual level of her company and provides her employees with a bigger purpose in their “day-to-day” operations. The role as a Holistic Trustee broadens the understanding of leaders` importance in sustainability and draws attention to female traits that are naturally suited for a sustainable leadership.