Addressing contemporary sustainability challenges requires higher education institutions to adopt integrative approaches that align education, research, and societal engagement. While service learning is widely recognized as an experiential pedagogical approach, its potential role in systematically integrating education and research for sustainable development remains underexplored. This study adopts conceptual research design and synthesizes prior literature on Education for Sustainable Development (ESD), service learning, and sustainability-oriented research. Based on this synthesis, the paper proposes an integrative conceptual framework that positions service learning as a central mechanism linking educational practices, research activities, and community engagement. The framework explains how service-learning fosters sustainability competencies, enhances civic engagement, and improves research relevance, thereby contributing to sustainability outcomes aligned with the United Nations Sustainable Development Goals (SDGs). By clarifying key mechanisms and pathways, this study advances theoretical understanding of sustainability-oriented service learning and offers practical insights for educators, researchers, institutions, and policymakers. The paper further outlines directions for future empirical research to test and refine the proposed framework.