The contextual changes create numerous demands on organizations to address stakeholders' expectations. In our contemporary dynamic society, characterized by rapid changes and sustainability, two main observations can be done. First, stakeholders have changed forms andnew stakeholders have appeared in the context of project organizations. These are developed to address rapid changes especially in regards to those in the context of sustainability. Second, the stakeholders' expectations have been shifting in relation to economic, environmental and socialsustainability. Taken together, managing project stakeholders' expectations in regards to sustainability is becoming a challenge for the project's own sustainability and success, and thus for the project organization as a whole. Thus, project organizations need to build sustainable relationships with their stakeholders in order to manage these rapid changes. The argument in this paper is that securing and building sustainable relationships require trusting relationships with stakeholders in temporary organizations. Additionally, trusting relationships become especiallyimportant when the project outcome has a sustainable scope and when they have agile life cycles. The purpose of this paper is to theoretically explore the importance and effects of trust between stakeholders in agile projects in the lens of current research on trust and project management. Trust has been found to be a central component of the stakeholders' relationship. The research discloses the effects of trust on internal and external processes as well as appearances, in stakeholder relationship-building, in order to reach sustainability. The main value of this paper is that concept “trust” is not a template to use depending on the kind of project, but a concept that needs to be worked with in every new relationship and maintained with the ones existing.