This research examines the Kartarpur Corridor as a transformative model of trans-local and sub-national diplomacy between India and Pakistan. Connecting shared religious and cultural heritage, it fosters peace through people-to-people contact, emotional healing, and spiritual engagement. Despite structural challenges like political volatility, restricted access, and administrative barriers, the Corridor offers a counter-narrative to hostility. With institutional support and integration into broader cultural diplomacy frameworks, it holds the potential to become a lasting symbol and mechanism of cross-border peace, unity, and reconciliation in South Asia.