Indonesia’s religious diversity is an important social asset for national development, yet persistent religious intolerance and interfaith conflict continue to challenge religious harmony. Previous studies have examined development communication and Gus Dur’s pluralism separately, particularly in relation to religious tolerance, social diversity, and human rights. However, limited research has integrated Gus Dur’s pluralistic thought into development communication for fostering interfaith harmony in Indonesia. This study aims to explore the manifestation of Gus Dur’s pluralism through development communication for interfaith unity. Using a qualitative approach and library research design, the study analyzes primary sources from Gus Dur’s works, including My Islam, Your Islam, Our Islam, God Does Not Need to Be Defended, and Gus Dur Speaks, supported by relevant books and journal articles. Data were collected through systematic reading and documentation, then organized, categorized, and analyzed descriptively to identify recurring concepts. The findings reveal three main pillars: interfaith dialogue, advocacy for tolerance-oriented policies, and conflict prevention and resolution. These pillars position religious leaders as development communicators who translate pluralistic values into practical efforts to promote mutual understanding, protect minority rights, and strengthen social cohesion. The novelty lies in integrating Gus Dur’s pluralism with development communication as a practical framework for fostering interfaith harmony in Indonesia.