Resilience is a widely used concept among development, environmental, security and peacebuilding organizations. However, resilience has rarely been applied in conjunction with the potentially complementary concept of environmental security. Therefore, this paper explores how the concepts of resilience and environmental security can be jointly applied by non-governmental organizations working to implement peacebuilding projects in developing countries. We first review definitions of the concepts and explore their strengths and pitfalls. Second, we develop a conceptual framework for a joint application whereby environmental security sharpens the scope of resilience, while resilience allows for taking issues into account that a traditional environmental security perspective might miss. Finally, we apply the conceptual framework to a case study from Palestine.