For any program, there are various individuals and organizations who have an interest in its existence, resources, services, implementation, outcomes, and/or impact. Engaging diverse individuals in evaluation design, conduct, and dissemination is critical to incorporating context and perspectives that allow evaluation findings to be more useful, meaningful, and trustworthy. In turn, evaluation can both better serve the needs and interests of the people who are most affected and also lead to program and policy improvement. Engagement is not unique to evaluation research. In fact, the body of literature on engagement science and practice is rich in adjacent fields. We draw on our experiences as professional evaluators who have incorporated engagement in our evaluative activities, and as researchers who have studied the science and practice of engagement in other contexts, to better equip evaluation practitioners to incorporate robust engagement in their evaluation work.