Engaging with stakeholders is an essential part of any complete nuclear programme. Involving stakeholders in decision making processes, even those stakeholder groups that do not have a direct role in making those decisions, can enhance public confidence in the application of nuclear science and technology and strengthen communication among the key organizations in a nuclear programme. This publication provides theoretical and practical guidance on the development and implementation of stakeholder engagement programmes and activities. The key principles of stakeholder engagement are identified in it. It also includes tools such as templates to help establish a stakeholder engagement programme and identify associated activities, including tools for stakeholder analysis. The guidance provided can be further developed and adjusted to each specific type of facility, moment in its life cycle, and/or the group of stakeholders with which to engage. The publication demonstrates the importance of stakeholder engagement throughout the life cycle of all nuclear facilities, including operating and new reactors, all aspects of the nuclear fuel cycle, from uranium mining to spent fuel and radioactive waste management, decommissioning, and non-power applications.